Question 1

How many Chambers are in the human heart?

Accepted Answer

Answer reason: The human heart has four chambers: right atrium, right ventricle, left atrium, and left ventricle. The atria receive blood returning to the heart, and the ventricles pump blood out to the lungs and systemic circulation. This four-chamber structure supports separation of oxygen-poor and oxygen-rich blood for efficient circulation. Therefore, the correct answer is four.
Category reason: This question tests a basic structural fact about the heart (number of chambers), which is foundational cardiovascular anatomy/physiology rather than a nursing care decision.

Question 2

Which is known as the "silent killer disease"?

Accepted Answer

Answer reason: Hypertension is commonly called the "silent killer" because it often produces no symptoms for years while progressively damaging target organs. Uncontrolled high blood pressure increases risk of stroke, myocardial infarction, heart failure, chronic kidney disease, and retinopathy. Because patients may feel well, routine screening and adherence to treatment are critical to prevent complications. The other options typically cause noticeable acute symptoms such as fever and respiratory or gastrointestinal complaints.
Category reason: This item tests recognition of a key clinical concept about a cardiovascular condition (hypertension) and its typical asymptomatic nature, which is foundational knowledge under the Cardiovascular System rather than a nursing action/priority scenario.

Question 3

The most common type of hypertension is?

Accepted Answer

Answer reason: Primary (essential) hypertension accounts for the large majority of hypertension cases (about 90–95%) and has no single identifiable secondary cause. Secondary hypertension occurs due to an underlying condition (e.g., renal disease, endocrine disorders) and is much less common. Malignant hypertension is a severe, acute presentation rather than the most common type. Isolated systolic hypertension is common in older adults but is not the overall most common category compared with essential hypertension.
Category reason: This item tests epidemiologic classification of hypertension types, a foundational concept within cardiovascular disease knowledge rather than a nursing intervention or priority-setting scenario.

Question 4

Deoxygenated blood is carried by?

Accepted Answer

Answer reason: The pulmonary artery is the exception to the rule that arteries carry oxygenated blood; it carries deoxygenated blood from the right ventricle to the lungs for oxygenation. In contrast, the pulmonary veins return oxygenated blood from the lungs to the left atrium. The aorta and left ventricle are part of systemic circulation and contain oxygenated blood after it leaves the lungs.
Category reason: This question tests foundational cardiovascular physiology/anatomy about the direction and oxygen content of blood flow in major vessels, which is biomedical knowledge rather than a nursing intervention or safety decision.

Question 5

Which electrolyte imbalance causes tall peaked T waves?

Accepted Answer

Answer reason: Tall, narrow, peaked T waves are a classic early ECG manifestation of hyperkalemia due to faster ventricular repolarization. As potassium rises further, ECG changes can progress to PR prolongation, QRS widening, sine-wave pattern, and ventricular fibrillation/asystole. Hypocalcemia more typically prolongs the QT interval, while hyponatremia does not characteristically produce peaked T waves. Hypermagnesemia can cause PR/QRS prolongation and heart block rather than the classic peaked T waves.
Category reason: The item tests recognition of a specific ECG finding (peaked T waves) and its underlying electrolyte cause, which is foundational cardiovascular physiology/pathophysiology knowledge rather than a nursing intervention or prioritization scenario.

Question 6

The outermost layer of the heart is called?

Accepted Answer

Answer reason: The pericardium is the outermost covering of the heart (a fibrous sac with a serous lining) that encloses and protects the heart and reduces friction during cardiac motion. The epicardium is the outermost layer of the heart wall itself (visceral layer of serous pericardium), while myocardium is the muscular middle layer and endocardium is the inner lining. Because the question asks for the outermost layer of the heart overall, the pericardium is the best answer.
Category reason: This is a foundational question about the anatomical layers/coverings of the heart, which is primarily studied within the Cardiovascular System in nursing science rather than nursing care decision-making.

Question 7

The pacemaker of the heart is known as?

Accepted Answer

Answer reason: The sinoatrial (SA) node is the heart’s primary pacemaker because it has the highest intrinsic rate of spontaneous depolarization, initiating each normal heartbeat. Its impulses spread through the atria to the atrioventricular (AV) node, which delays conduction before transmitting to the ventricles. The Bundle of His and Purkinje fibers are downstream conduction pathways rather than the primary pacemaker under normal conditions.
Category reason: This is a foundational question about the cardiac conduction system and which structure initiates normal heart rhythm, which falls under the Cardiovascular System.

Question 8

Which rhythm is most common in sudden cardiac arrest?

Accepted Answer

Answer reason: Sudden cardiac arrest most commonly presents initially as a shockable rhythm, particularly ventricular fibrillation (or pulseless ventricular tachycardia). VF causes chaotic, ineffective ventricular electrical activity leading to no meaningful cardiac output and rapid loss of pulse. Although asystole is a common rhythm found later, it is less commonly the initial rhythm in sudden arrest, especially in out-of-hospital events. Sinus tachycardia and atrial flutter are organized rhythms and typically do not directly represent cardiac arrest rhythms.
Category reason: This question tests recognition of the most common initial electrocardiographic rhythm in sudden cardiac arrest, which is foundational cardiovascular electrophysiology knowledge rather than a nursing intervention/prioritization scenario.

Question 9

The sinoatrial (SA) node is located in the?

Accepted Answer

Answer reason: The sinoatrial (SA) node is the heart’s primary pacemaker and is located in the right atrium, near the junction where the superior vena cava enters. From the SA node, depolarization spreads through the atria to initiate atrial contraction. The AV node and His-Purkinje system are located more centrally/in the ventricles, not where the SA node resides.
Category reason: This question tests knowledge of the heart’s electrical conduction system anatomy (where the SA node is located), which is a foundational concept in the Cardiovascular System rather than a nursing intervention or clinical judgment scenario.

Question 10

Which arrhythmia often follows myocardial infarction?

Accepted Answer

Answer reason: Myocardial infarction creates ischemic and electrically unstable myocardium, which predisposes to malignant ventricular arrhythmias. Ventricular fibrillation is a well-known early, life-threatening dysrhythmia associated with acute MI and is a common cause of sudden cardiac death in this setting. While sinus tachycardia or bradycardia can occur, they are generally less specific and less dangerous than VF. Atrial flutter may occur but is not the classic arrhythmia most often emphasized as a post-MI lethal rhythm.
Category reason: This item tests knowledge of common cardiac rhythm complications of myocardial infarction (pathophysiology and typical post-MI dysrhythmias), which is foundational cardiovascular science rather than a nursing action/prioritization scenario.

Question 11

Which of the following is a symptom of left-sided heart failure?

Accepted Answer

Answer reason: Left-sided heart failure leads to ineffective left ventricular pumping, causing blood to back up into the pulmonary veins and capillaries. This increased pulmonary hydrostatic pressure results in pulmonary congestion and pulmonary edema, manifesting as dyspnea, crackles, and orthopnea. In contrast, peripheral edema, jugular venous distention, and hepatomegaly are classic findings of right-sided heart failure due to systemic venous congestion.
Category reason: The item tests recognition of pathophysiologic consequences of left- vs right-sided heart failure (pulmonary vs systemic congestion), which is foundational cardiovascular system knowledge rather than a nursing intervention or prioritization scenario.

Question 12

A hypertensive emergency is diagnosed when?

Accepted Answer

Answer reason: A hypertensive emergency is defined by severe blood pressure elevation (typically ≥180 systolic and/or ≥120 diastolic) accompanied by evidence of acute target-organ damage (e.g., encephalopathy, stroke, acute coronary syndrome, pulmonary edema, acute kidney injury, aortic dissection). Severe BP elevation without acute end-organ injury is considered a hypertensive urgency, not an emergency. Therefore, the presence of organ damage with BP ≥180/120 mmHg best fits the diagnosis.
Category reason: The question tests the diagnostic definition/criteria for a hypertensive emergency, which is foundational knowledge about cardiovascular pathology rather than a nursing intervention or prioritization scenario.

Question 13

Which pulse site is best for assessing circulation to the lower limb?

Accepted Answer

Answer reason: The femoral pulse is the major proximal arterial pulse supplying the lower extremity and is a key site for assessing lower-limb perfusion. Radial and carotid pulses reflect upper-extremity and central circulation rather than lower-limb flow. Popliteal is also a lower-limb pulse, but the femoral pulse is more proximal and is generally the best indicator of overall lower-extremity arterial circulation, especially when distal pulses may be diminished.
Category reason: This question primarily tests knowledge of anatomical arterial pulse sites and their relationship to lower-extremity blood flow, which is core cardiovascular system science rather than nursing judgment or intervention prioritization.

Question 14

What is the primary mechanism of edema in heart failure?

Accepted Answer

Answer reason: In heart failure, reduced cardiac output leads to elevated venous pressures and congestion, which increases capillary hydrostatic pressure. This higher hydrostatic pressure pushes fluid out of the vascular space into the interstitial tissues, producing peripheral and/or pulmonary edema. Increased oncotic pressure would oppose edema, not cause it, and decreased serum sodium is not the primary Starling-force driver of fluid extravasation in HF.
Category reason: The question tests the pathophysiologic basis (Starling forces and congestion) of edema formation in heart failure, which is core cardiovascular system science rather than a nursing intervention or prioritization scenario.

Question 15

How many times does a healthy adult's heart beat on average in a minute?

Accepted Answer

Answer reason: A commonly taught average resting heart rate for a healthy adult is about 72 beats per minute. While the normal resting range is broader (approximately 60–100 bpm), the question asks for the average value rather than the range. Among the options, 72 best matches the standard average cited in basic cardiovascular physiology. The other options are higher or less representative of the typical average.
Category reason: This question tests baseline knowledge of normal adult resting heart rate, a fundamental concept in cardiovascular physiology rather than a nursing decision or intervention.

Question 16

What is the name for the heart's pacemaker?

Accepted Answer

Answer reason: The sinoatrial (SA) node is the heart’s primary pacemaker because it has the highest intrinsic rate of spontaneous depolarization and initiates each normal heartbeat. It generates impulses that spread through the atria, leading to atrial contraction before conduction reaches the AV node. The AV node mainly delays conduction to allow ventricular filling, while the Bundle of His and Purkinje fibers primarily conduct impulses through the ventricles rather than set the normal rhythm.
Category reason: This question tests foundational knowledge of the cardiac conduction system and which structure initiates normal heart rhythm, which is a core concept within the Cardiovascular System.

Question 17

What is the term for heart attack from blockage of blood flow to the heart muscles?

Accepted Answer

Answer reason: A heart attack caused by blockage of blood flow to the heart muscle is a myocardial infarction (MI), typically due to occlusion of a coronary artery leading to ischemia and necrosis of myocardium. Stroke refers to interrupted blood flow in the brain, not the heart. Cardiac arrest is the sudden cessation of effective cardiac pumping and can be a consequence of MI but is not the term for ischemic myocardial injury. Hypertension is elevated blood pressure and is a risk factor for MI, not the event itself.
Category reason: The question tests knowledge of the medical term and underlying concept of coronary blood flow blockage causing heart muscle death, which is core Cardiovascular System foundational science rather than a nursing intervention or prioritization scenario.

Question 18

Chest pain due to reduced blood supply to heart is called?

Accepted Answer

Answer reason: Angina pectoris is chest pain or discomfort caused by myocardial ischemia, typically from reduced coronary blood flow without permanent myocardial necrosis. This pain is usually precipitated by exertion or stress and relieved by rest or nitroglycerin. By contrast, infarction refers to tissue death (myocardial infarction), arrhythmia is an abnormal heart rhythm, and palpitations are the sensation of an abnormal heartbeat.
Category reason: The question tests recognition of a cardiovascular definition (ischemia-related chest pain) rather than nursing interventions or prioritization, so it fits foundational biomedical knowledge in the Cardiovascular System.

Question 19

Silent killer refers to:

Accepted Answer

Answer reason: Hypertension is classically called the “silent killer” because it is often asymptomatic for years while causing progressive end-organ damage. Chronic elevated blood pressure increases risk of stroke, myocardial infarction, heart failure, chronic kidney disease, and retinopathy. In contrast, influenza and tuberculosis typically present with notable symptoms, and diabetes is often termed a “silent disease” but the most common single best match for “silent killer” is hypertension.
Category reason: This item tests foundational knowledge of a cardiovascular condition and its typical clinical characterization (“silent killer”), which fits biomedical understanding of the Cardiovascular System rather than a nursing intervention/prioritization scenario.

Question 20

The normal blood pressure (adult) is?

Accepted Answer

Answer reason: Normal adult blood pressure is classically taught as approximately 120/80 mmHg (systolic/diastolic) at rest. Readings such as 140/100 mmHg and 160/90 mmHg fall in hypertensive ranges. The option 110/90 mmHg has an abnormally narrow pulse pressure and an elevated diastolic relative to systolic, making it not a normal adult value.
Category reason: This question tests knowledge of normal physiologic cardiovascular vital-sign values rather than nursing interventions or prioritization, so it fits foundational cardiovascular system content.

Question 21

Blood Pressure is measured in units of?

Accepted Answer

Answer reason: Blood pressure is a measure of the force exerted by circulating blood on arterial walls and is conventionally expressed as millimeters of mercury (mm Hg), reflecting the height of a mercury column in a manometer. This standard unit is used clinically for both systolic and diastolic pressures (e.g., 120/80 mm Hg). °F is a temperature unit, beats per minute measure heart rate, and N/m² (pascal) is an SI pressure unit but is not the conventional clinical unit for BP measurement.
Category reason: This question tests foundational knowledge about how blood pressure (a cardiovascular parameter) is quantified and documented, which is biomedical science rather than a nursing intervention or judgment scenario.

Question 22

How many chambers are there in human heart?

Accepted Answer

Answer reason: The normal human heart has four chambers: two atria (right and left) and two ventricles (right and left). The right side receives deoxygenated blood and pumps it to the lungs, while the left side receives oxygenated blood and pumps it to the systemic circulation. Therefore, the correct option is 4.
Category reason: This item tests foundational knowledge of heart anatomy (number of cardiac chambers), which is a core concept within the Cardiovascular System rather than nursing intervention or clinical decision-making.

Question 23

Which vein is commonly used for central venous catheterization?

Accepted Answer

Answer reason: Central venous catheterization most commonly uses large central veins such as the internal jugular, subclavian, or femoral veins, with the internal jugular being a standard, frequently preferred site. The cephalic and brachial veins are peripheral upper-extremity veins typically used for peripheral IV access or PICC-related approaches rather than standard central line insertion. The femoral vein is also a central access option but is generally less preferred for routine use due to higher infection and thrombosis risk compared with internal jugular access. Therefore, the jugular vein is the best answer among the options.
Category reason: The question tests knowledge of which anatomical venous sites are used for central venous access, focusing on vascular anatomy and common clinical access routes rather than nursing prioritization or a care scenario.

Question 24

Vena cava carries blood to:

Accepted Answer

Answer reason: The superior and inferior vena cava return deoxygenated systemic venous blood to the right atrium of the heart. From the right atrium, blood flows to the right ventricle and then is pumped to the lungs via the pulmonary arteries. Therefore, the vena cava carries blood directly to the heart, not to the lungs or specific organs like the kidneys or liver.
Category reason: This question tests foundational knowledge of blood flow pathways and major vessels, which is a core topic within the Cardiovascular System rather than nursing intervention or safety decision-making.

Question 25

Which part of the heart is responsible for pumping oxygenated blood to the rest of the body?

Accepted Answer

Answer reason: The left ventricle pumps oxygenated blood into the aorta, which distributes it to the systemic circulation (the rest of the body). The left atrium primarily receives oxygenated blood from the pulmonary veins and passes it to the left ventricle. The right-sided chambers handle deoxygenated blood returning from the body and pump it to the lungs via the pulmonary artery. Therefore, the left ventricle is the chamber responsible for systemic pumping of oxygenated blood.
Category reason: This question tests knowledge of cardiac chamber function and systemic versus pulmonary circulation, which is foundational cardiovascular anatomy/physiology rather than a nursing intervention or clinical judgment scenario.

Question 26

What is the normal pulse rate for a healthy adult?

Accepted Answer

Answer reason: A normal resting adult heart rate is generally defined as 60–100 beats per minute. Rates below 60 bpm may be normal in well-conditioned athletes but are not considered the standard reference range for the general healthy adult population. Rates above 100 bpm indicate tachycardia and are not normal at rest. Therefore, 60–100 bpm is the best answer.
Category reason: This question tests foundational knowledge of normal vital-sign ranges (resting heart rate) rather than a nursing intervention or prioritization scenario, fitting cardiovascular physiology/basics.

Question 27

Which blood vessel carries blood at the highest pressure?

Accepted Answer

Answer reason: Arteries carry blood away from the heart and are exposed to the highest pressures generated during ventricular systole, especially in the aorta and large arteries. Their thick, elastic muscular walls are designed to withstand and dampen these high pressures. Pressure progressively falls across arterioles and capillary beds, and is lowest in venules and veins, which function as capacitance vessels.
Category reason: This question tests knowledge of where blood pressure is highest within the circulatory system and how vessel type relates to pressure, which is a core concept of the Cardiovascular System.

Question 28

The first Korotkoff sound corresponds to:

Accepted Answer

Answer reason: Korotkoff sounds are heard during cuff deflation when blood first begins to flow through a previously occluded artery. The first audible tapping sound (Phase I) occurs at the pressure where arterial flow just returns, which corresponds to systolic blood pressure. Diastolic pressure is identified later when the sounds disappear (Phase V in adults). Mean arterial and venous pressures are not directly determined by Korotkoff sound phases in routine auscultatory BP measurement.
Category reason: This question tests the physiological basis of auscultatory blood pressure measurement and the meaning of Korotkoff sound phases, which is core cardiovascular physiology rather than a nursing intervention or prioritization decision.

Question 29

What is the medical term for a rapid, irregular heartbeat?

Accepted Answer

Answer reason: An arrhythmia is any abnormal heart rhythm and is the umbrella term used for irregular heartbeats, including rhythms that can be rapid and irregular. Bradycardia refers to a slow heart rate, and tachypnea refers to rapid breathing rather than heart rate. Tachycardia means a fast heart rate but does not necessarily imply irregularity, so it is less precise than arrhythmia for a rapid, irregular heartbeat.
Category reason: This question tests recognition of cardiovascular medical terminology describing heart rhythm abnormalities rather than a nursing intervention or prioritization, so it fits foundational cardiovascular system knowledge.

Question 30

What is the normal resting heart rate for an adult?

Accepted Answer

Answer reason: A normal adult resting heart rate is generally 60–100 beats per minute. Rates of 150–180 bpm are typically seen with significant tachycardia (e.g., exertion, fever, arrhythmia) rather than normal rest. A resting rate of 20–50 bpm is abnormally low for most adults and would suggest marked bradycardia unless the person is a highly trained athlete and asymptomatic.
Category reason: The item tests baseline normal physiology/vital-sign norms for the heart, which is foundational cardiovascular knowledge rather than a nursing intervention or prioritization scenario.

Question 31

Which is ideal human heartbeat rate per minute?

Accepted Answer

Answer reason: The normal resting heart rate for a healthy adult is typically 60–100 beats per minute. Rates below 60 can indicate bradycardia (though may be normal in trained athletes), and rates above 100 at rest suggest tachycardia. Therefore, among the choices, 60–100 best matches the ideal/normal adult resting range.
Category reason: This question tests normal physiologic parameters of cardiac function (resting heart rate), which is foundational cardiovascular system knowledge rather than a nursing intervention or prioritization scenario.

Question 32

Myocardial infarction is commonly called?

Accepted Answer

Answer reason: A myocardial infarction (MI) is caused by acute interruption of coronary blood flow leading to ischemia and necrosis of heart muscle, which is commonly termed a “heart attack.” Stroke refers to interruption of cerebral blood flow, not myocardial tissue. Cardiac arrest is the cessation of effective cardiac mechanical activity and may occur as a complication of MI but is not synonymous with it. Angina is chest pain due to myocardial ischemia without infarction/necrosis.
Category reason: The item tests recognition of a cardiovascular medical term (myocardial infarction) and its common name, which is foundational biomedical knowledge rather than a nursing intervention or priority decision.

Question 33

Which of the following is incorrect about the causative factors of cardiac myopathy?

Accepted Answer

Answer reason: Cardiomyopathies can be caused by genetic (hereditary) factors, chronic alcohol toxicity (alcoholic cardiomyopathy), and infections such as viral myocarditis that can progress to dilated cardiomyopathy. "Overeating" is not a recognized direct etiologic cause of cardiomyopathy, although it may contribute indirectly via obesity-related hypertension or ischemic heart disease. Therefore, among the listed choices, overeating is the incorrect causative factor.
Category reason: The item tests knowledge of etiologies of cardiomyopathy (genetic, toxic, infectious causes), which is foundational cardiovascular disease content rather than a nursing intervention or prioritization scenario.

Question 34

An individual blood cell takes about how long to make a complete circuit of the body?

Accepted Answer

Answer reason: At rest, the systemic circulation time (a full circuit through the body) is commonly approximated as about 1 minute. This aligns with typical adult cardiac output and blood volume, yielding an average circulation time near 60 seconds. The longer times (90–120 seconds) are less consistent with the standard physiologic estimate used in basic cardiovascular teaching.
Category reason: The question tests foundational physiology of blood flow and circulation time, which is a cardiovascular system concept rather than a nursing intervention or prioritization task.

Question 35

Which vessel carries Deoxygenated blood from the heart to the lungs?

Accepted Answer

Answer reason: Deoxygenated blood leaves the right ventricle and is carried to the lungs via the pulmonary artery (pulmonary trunk and its branches) for gas exchange. The pulmonary veins carry oxygenated blood from the lungs to the left atrium, so they are the opposite direction and oxygenation status. The aorta carries oxygenated blood from the left ventricle to the systemic circulation.
Category reason: This question tests foundational knowledge of blood flow through major heart vessels (pulmonary artery vs pulmonary vein vs aorta), which is core cardiovascular anatomy/physiology rather than a nursing intervention decision.

Question 36

Cardiac myopathy is a condition characterized by __.?

Accepted Answer

Answer reason: Cardiomyopathy refers to disease of the heart muscle that commonly leads to changes in myocardial structure and function, frequently manifesting as ventricular dilation and cardiomegaly (enlarged heart), especially in dilated cardiomyopathy. The other options describe lung size or airflow problems, which are primarily respiratory conditions. "Constriction of the heart" is not the typical defining feature of cardiomyopathy as a general term. Therefore, enlargement of the heart is the best match among the options.
Category reason: The item tests foundational knowledge about a cardiovascular disease definition/characteristic (cardiomyopathy and cardiomegaly) rather than nursing interventions or prioritization, so it fits NursingScience under the Cardiovascular System.

Question 37

2D-ECHO is primarily based on which technology?

Accepted Answer

Answer reason: 2D echocardiography produces real-time images of cardiac structures using high-frequency sound waves reflected from tissues (ultrasound). It does not use ionizing radiation like X-ray/CT and does not rely on magnetic fields like MRI. The transducer emits and receives ultrasound echoes, which are processed to form a 2D image of the heart.
Category reason: The item tests knowledge of the imaging modality used to assess the heart (echocardiography), which is foundational cardiovascular diagnostic technology rather than a nursing care decision.

Question 38

What is considered normal systolic blood pressure?

Accepted Answer

Answer reason: Normal adult systolic blood pressure is generally defined as 140 mm Hg are consistent with hypertension, and >150 mm Hg is clearly elevated in most adult guidelines. A systolic

Question 39

If a patient has a blood pressure of 160/90 mmHg, what is the patient’s pulse pressure?

Accepted Answer

Answer reason: Pulse pressure is calculated by subtracting the diastolic blood pressure from the systolic blood pressure. In this case, 160 mmHg minus 90 mmHg equals a pulse pressure of 70 mmHg.
Category reason: This question assesses understanding of basic cardiovascular physiology, specifically the definition and calculation of pulse pressure, which is a core concept within the cardiovascular system.

Question 40

The lower value of blood pressure is called?

Accepted Answer

Answer reason: Blood pressure is recorded as systolic/diastolic, where systolic is the higher number during ventricular contraction and diastolic is the lower number during ventricular relaxation. The question asks specifically for the lower value, which corresponds to diastolic pressure. Stroke volume and heart rate are cardiovascular parameters but are not the lower BP value on a reading.
Category reason: This item tests foundational knowledge of blood pressure terminology and cardiac cycle phases, which is core cardiovascular system physiology rather than a nursing intervention or safety decision.

Question 41

The main organ of the circulatory system is?

Accepted Answer

Answer reason: The heart is the central pump of the circulatory (cardiovascular) system, generating the pressure needed to move blood through arteries, capillaries, and veins. The brain coordinates body functions, the lungs are primarily responsible for gas exchange (respiratory system), and the kidneys regulate fluid/electrolytes and filter blood (urinary system). While these organs interact with circulation, they are not the main pumping organ that drives blood flow.
Category reason: This is a foundational anatomy/physiology knowledge question about the primary organ responsible for blood circulation, which best fits the Cardiovascular System subject rather than a nursing care/judgment task.

Question 42

How many chambers are there in a human heart.....?

Accepted Answer

Answer reason: The normal human heart has four chambers: right atrium, right ventricle, left atrium, and left ventricle. The atria receive blood (right from systemic veins, left from pulmonary veins) and the ventricles pump blood out (right to pulmonary artery, left to aorta). Therefore, the correct count of chambers is 4.
Category reason: This question tests basic structure of the heart (number of chambers), which is foundational cardiovascular anatomy/physiology knowledge rather than a nursing care decision, so it fits NursingScience under the Cardiovascular System.

Question 43

Heartbeat is controlled by...?

Accepted Answer

Answer reason: The heartbeat is initiated and regulated by the heart’s intrinsic pacemaker, the sinoatrial (SA) node, which generates spontaneous electrical impulses. These impulses travel through the cardiac conduction system to coordinate atrial and ventricular contraction. The liver, lungs, and kidneys can influence cardiovascular status indirectly (e.g., via metabolism, oxygenation, fluid balance), but they do not directly control the cardiac rhythm.
Category reason: This is a foundational question about cardiac conduction and regulation of heart rate, which is core content within the Cardiovascular System.

Question 44

Heart failure with preserved ejection fraction (formerly, diastolic heart failure) is associated with which of the following?

Accepted Answer

Answer reason: HFpEF is primarily a diastolic dysfunction problem in which the left ventricle is stiff and relaxes poorly, leading to elevated filling pressures despite a preserved ejection fraction. A common structural association is concentric left ventricular hypertrophy from chronic hypertension, which reduces ventricular compliance. Decreased ejection fraction characterizes HFrEF (systolic dysfunction), not HFpEF. Systemic hypotension and mitral regurgitation are not defining associations of HFpEF in the way LV hypertrophy is.
Category reason: The item tests pathophysiologic associations of HFpEF (diastolic dysfunction) and related cardiac structural changes (e.g., LV hypertrophy), which is foundational cardiovascular science.

Question 45

What is the heart muscles called?

Accepted Answer

Answer reason: The myocardium is the muscular middle layer of the heart wall and is responsible for the contractile force that pumps blood. The endocardium is the thin inner lining of the heart chambers and valves, not the muscle. The pericardium is the protective sac surrounding the heart, also not muscle. Therefore, the correct term for the heart muscle is myocardium.
Category reason: This question tests identification of a heart wall layer (myocardium vs endocardium/pericardium), which is foundational cardiovascular structure knowledge rather than a nursing care decision, so it belongs to the Cardiovascular System.

Question 46

What's the blood pressure (BP) in the case of a vasoconstrictor.....?

Accepted Answer

Answer reason: Vasoconstrictors narrow arterioles, increasing systemic vascular resistance (afterload). Mean arterial pressure is proportional to cardiac output multiplied by systemic vascular resistance, so increasing resistance tends to raise blood pressure if cardiac output is not markedly reduced. Clinically, many vasopressors (e.g., norepinephrine, phenylephrine) increase BP primarily by vasoconstriction.
Category reason: The question tests hemodynamic physiology—how changes in vascular tone (vasoconstriction) affect systemic vascular resistance and blood pressure—within cardiovascular function rather than a nursing care decision.

Question 47

Which valve prevents backflow from the pulmonary artery into the right ventricle?

Accepted Answer

Answer reason: The pulmonary valve is the semilunar valve located between the right ventricle and the pulmonary artery. It opens during right ventricular systole to allow ejection into the pulmonary artery and closes during diastole when arterial pressure exceeds ventricular pressure. This closure prevents blood from flowing back from the pulmonary artery into the right ventricle. The mitral and aortic valves are on the left side of the heart, and the tricuspid valve prevents backflow from the right ventricle to the right atrium (not from the pulmonary artery).
Category reason: This is a foundational question about cardiac valve anatomy and the direction of blood flow through the heart, which is best classified under the Cardiovascular System.

Question 48

Which blood vessel carries CO2 blood from the body to the heart?

Accepted Answer

Answer reason: Deoxygenated, CO2-rich blood from the systemic circulation returns to the right atrium through the superior and inferior vena cava. The aorta carries oxygenated blood away from the left ventricle to the body. The pulmonary artery carries deoxygenated blood from the heart to the lungs, and the pulmonary veins carry oxygenated blood from the lungs to the heart. Therefore, the vessel carrying CO2-rich blood from the body to the heart is the vena cava.
Category reason: This is a foundational question about the direction of blood flow and which major vessels return systemic venous (CO2-rich) blood to the heart, which is core cardiovascular system physiology/anatomy rather than nursing intervention or prioritization.

Question 49

Mitral valve stenosis can lead to which of the following?

Accepted Answer

Answer reason: Mitral stenosis obstructs left atrial emptying, raising left atrial and pulmonary venous pressures. During exercise, increased heart rate shortens diastolic filling time, worsening the transmitral gradient and abruptly increasing pulmonary capillary hydrostatic pressure. This can precipitate acute pulmonary edema with exertion, especially in more severe stenosis. The other options describe findings more typical of right-sided failure or low-output states and are not the hallmark consequence of isolated mitral stenosis.
Category reason: This question tests pathophysiologic consequences of a valvular heart lesion (mitral stenosis) on pulmonary pressures and exercise response, which is foundational cardiovascular system knowledge rather than a nursing intervention or prioritization scenario.

Question 50

Normal left ventricular ejection fraction (EF) is?

Accepted Answer

Answer reason: Normal left ventricular ejection fraction is typically in the mid-50s to about 70%, reflecting the percentage of end-diastolic volume ejected with each systolic contraction. Values like 20–30% and 35–45% suggest reduced systolic function consistent with heart failure with reduced EF. An EF above 80% is not considered normal and may reflect hyperdynamic states or measurement variation rather than a typical baseline.
Category reason: This item tests knowledge of a standard cardiac functional parameter (left ventricular ejection fraction) and its normal range, which is foundational cardiovascular physiology/assessment rather than a nursing intervention or prioritization scenario.

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