Question 1

Which human organ never rests?

Accepted Answer

Answer reason: The heart continually pumps blood throughout life without stopping; it does not take a break like other organs that can rest during sleep.

Question 2

How much time does it take to complete one heartbeat?

Accepted Answer

Answer reason: The duration of a cardiac cycle at a normal resting rate (~75 beats/min) is about 0.8 seconds per heartbeat (60/75 ≈ 0.8 s).

Question 3

Blood pressure is highest when leaving which heart chamber?

Accepted Answer

Answer reason: The left ventricle ejects blood into the systemic circulation via the aorta and must generate the highest pressure of all chambers to perfuse the entire body.

Question 4

To which body part does the heart refer?

Accepted Answer

Answer reason: Among the options, only the pulmonary artery is a cardiovascular structure directly associated with the heart; the others are unrelated organs.

Question 5

Blood moving from the atria into the ventricles flow through which two valves?

Accepted Answer

Answer reason: Blood passes from atria to ventricles through the atrioventricular valves: tricuspid on the right and mitral (bicuspid) on the left.

Question 6

Are vibratory sensations caused by the heart and felt on the body surface, always associated with murmurs, feel like a ringing phone is known as?

Accepted Answer

Answer reason: A palpable vibratory sensation due to turbulent blood flow from significant murmurs is called a thrill. Heaves are forceful lifts of the chest wall, tactile fremitus pertains to lung vibrations, and S1 & S2 are normal heart sounds.

Question 7

A patient’s potassium value is 3.2 mEq/L. Which of the following is an expected finding on his electrocardiogram as a result of this lab value?

Accepted Answer

Answer reason: K+ of 3.2 mEq/L indicates hypokalemia, which classically causes flattened T waves and prominent U waves on ECG. Absent P waves and tall T waves suggest hyperkalemia, and ST elevation is not typical of hypokalemia.

Question 8

Which vein is commonly used in bypass surgery?

Accepted Answer

Answer reason: The great saphenous vein is the standard conduit harvested for coronary artery bypass grafting due to its length, caliber, and accessibility.

Question 9

What is the outermost layer of the heart called?

Accepted Answer

Answer reason: The epicardium is the outermost layer of the heart wall (visceral layer of the serous pericardium). The pericardium is the surrounding sac, myocardium is the muscular middle layer, and endocardium is the inner lining.

Question 10

Allen's test checks the patency of which artery to assess blood flow to the hand?

Accepted Answer

Answer reason: The modified Allen test evaluates collateral circulation by releasing the ulnar artery; rapid return of color indicates a patent ulnar artery before radial puncture.

Question 11

What is the average heartbeat per minute in a normal person?

Accepted Answer

Answer reason: The typical adult resting heart rate averages around 72 beats per minute (normal range 60–100).

Question 12

What is the membranous covering of the heart called?

Accepted Answer

Answer reason: The heart is enclosed by the pericardium; meninges cover the brain and spinal cord, pleura cover the lungs, and peritoneum lines the abdominal cavity.

Question 13

Kaussmaul sign is generally seen in which condition?

Accepted Answer

Answer reason: Kussmaul sign is a paradoxical rise in jugular venous pressure with inspiration due to impaired right ventricular filling; it is characteristic of right-sided heart failure (and conditions like constrictive pericarditis).

Question 14

Which part of the heart acts as the pacemaker?

Accepted Answer

Answer reason: The sinoatrial (SA) node has the highest automaticity and normally initiates the heartbeat, functioning as the heart’s primary pacemaker.

Question 15

What is the largest artery in the body?

Accepted Answer

Answer reason: The aorta is the largest artery, originating from the left ventricle and distributing oxygenated blood to the body; veins and capillaries are not arteries.

Question 16

What is the most common complication of spinal anesthesia?

Accepted Answer

Answer reason: Spinal anesthesia causes sympathetic blockade leading to peripheral vasodilation and venous pooling, reducing preload and producing hypotension—the most common complication.

Question 17

What is the correct sound of the heart?

Accepted Answer

Answer reason: Normal heart sounds are S1 followed by S2, heard as “lub-dub” due to closure of the AV valves then semilunar valves.

Question 18

In which heart chamber does the heartbeat start?

Accepted Answer

Answer reason: The heartbeat originates at the sinoatrial (SA) node in the right atrium, considered the first chamber.

Question 19

The endothelium is located in which layer of a blood vessel?

Accepted Answer

Answer reason: Endothelium forms the inner lining of blood vessels and is part of the tunica intima (interna). The media is smooth muscle, the externa is connective tissue, and vasa vasorum are small vessels in the wall, not a layer.

Question 20

A client is admitted for a possible pacemaker insertion. The nurse must know that the sinoatrial (SA) node, known as the heart's pacemaker, has an intrinsic rate of?

Accepted Answer

Answer reason: The SA node’s normal intrinsic firing rate is 60–100 beats per minute; lower ranges reflect AV junction (40–60) or ventricular pacemakers (20–40).

Question 21

A client is admitted with a diagnosis of nodal bigeminy. The nurse knows that the atrioventricular (AV) node has an intrinsic rate of?

Accepted Answer

Answer reason: The AV node’s intrinsic pacemaker rate is about 40–60 bpm (often cited up to 70), fitting the 40–70 beats/minute range. SA node is 60–100; ventricular Purkinje focus is ~20–40.

Question 22

Clients with mitral stenosis would likely manifest symptoms associated with congestion in the?

Accepted Answer

Answer reason: Mitral stenosis elevates left atrial and pulmonary venous pressures, causing pulmonary congestion; it does not affect the descending aorta, SVC, or the conduction system (Bundle of His).

Question 23

A client is admitted with a diagnosis of Myocardial Infarction (MI). The client is complaining of chest pain. The nurse knows that pain related to an MI is due to?

Accepted Answer

Answer reason: MI pain results from myocardial ischemia—insufficient oxygen delivery to cardiac muscle—leading to anaerobic metabolism and accumulation of metabolites that stimulate pain receptors.

Question 24

The nurse is teaching a client with dysrhythmia about the electrical pathway of an impulse as it travels through the heart. The nurse knows that the normal pathway is?

Accepted Answer

Answer reason: Normal cardiac conduction travels from the SA node to the AV node, then through the Bundle of His and Purkinje fibers.

Question 25

The nurse is teaching a client with cardiac disease about the anatomy and physiology of the heart. The nurse identifies the pathway of blood flow through the heart as?

Accepted Answer

Answer reason: Systemic venous blood enters the right atrium, flows to the right ventricle, goes through the pulmonary circulation to the left atrium, and then to the left ventricle for systemic outflow.

Question 26

The nurse is performing a cardiac assessment on a client. The nurse knows that the correct order of blood flow through the valves of the heart is?

Accepted Answer

Answer reason: Blood flows from the right atrium through the tricuspid valve to the right ventricle, then through the pulmonary valve to the lungs, returns to the left atrium and passes through the mitral valve to the left ventricle, and exits through the aortic valve.

Question 27

What is the term for a pulse rate that is abnormally slow?

Accepted Answer

Answer reason: An abnormally slow heart rate is called bradycardia; tachycardia is fast and dyspnea is difficulty breathing.

Question 28

Which of the following is included in the causes of cardiac arrest?

Accepted Answer

Answer reason: All listed conditions can precipitate cardiac arrest: arrhythmias directly cause arrest, while coronary artery disease and its underlying atherosclerosis lead to myocardial ischemia and malignant arrhythmias.

Question 29

Which of the following organs never rests?

Accepted Answer

Answer reason: The heart must continuously contract to maintain circulation throughout life; it cannot stop or "rest" without causing death. Other organs can enter reduced activity (e.g., during sleep).

Question 30

In a blood pressure reading of 120/80 mm Hg, what does the 120 represent?

Accepted Answer

Answer reason: In a BP of 120/80, the first (higher) number is the systolic pressure—the peak arterial pressure during ventricular contraction.

Question 31

How many chambers are there in the human heart?

Accepted Answer

Answer reason: The human heart has four chambers: right and left atria and right and left ventricles.

Question 32

What is the term for an irregular heartbeat?

Accepted Answer

Answer reason: Arrhythmia is the medical term for an irregular heart rhythm; bradycardia and tachycardia describe slow or fast rates, and beats per minute is a measurement.

Question 33

Blood pressure raises in which condition?

Accepted Answer

Answer reason: During exercise sympathetic stimulation increases heart rate, stroke volume, and peripheral vasoconstriction, raising blood pressure. Sleep typically lowers BP; emotion may vary, but exercise is the most consistent correct choice.

Question 34

Which is the largest vein in the body?

Accepted Answer

Answer reason: The inferior vena cava is the largest vein by diameter, returning deoxygenated blood from the lower body to the heart; the superior vena cava and femoral vein are smaller and cerebral veins are much smaller.

Question 35

Which heart chamber receives blood returning from the lungs?

Accepted Answer

Answer reason: Oxygenated blood returns from the lungs via the pulmonary veins and enters the left atrium.

Question 36

Which organ receives only oxygenated blood?

Accepted Answer

Answer reason: The liver receives a dual blood supply: oxygenated blood via the hepatic artery and deoxygenated, nutrient-rich blood via the portal vein. In contrast, the spleen is supplied only by the splenic artery (oxygenated blood).

Question 37

Which is the largest artery in the body?

Accepted Answer

Answer reason: The aorta is the largest artery by diameter and carries blood from the left ventricle to systemic circulation.

Question 38

Where is the SA node located in the heart?

Accepted Answer

Answer reason: The sinoatrial (SA) node, the heart’s primary pacemaker, is located in the right atrial wall near the junction with the superior vena cava.

Question 39

Hypertension is a term used for?

Accepted Answer

Answer reason: Hypertension by definition means elevated arterial blood pressure, not a change in heart rate.

Question 40

Which of the following is true regarding great vessels of heart?

Accepted Answer

Answer reason: Only the aorta carries oxygenated blood from the left ventricle to the systemic circulation. SVC returns blood from above the diaphragm but not from heart/lungs; pulmonary veins carry oxygenated (not deoxygenated) blood to the left atrium; IVC returns blood to the right atrium (it does not drain from it).

Question 41

Which of the following best describes the location where the carotid pulse can be found?

Accepted Answer

Answer reason: The carotid artery runs along the anterior neck lateral to the trachea and is palpated there for the carotid pulse.

Question 42

Where is the sinoatrial node located?

Accepted Answer

Answer reason: The SA node, the heart’s pacemaker, lies in the superior posterolateral wall of the right atrium near the SVC, not in the septum or between chambers.

Question 43

All of the following are normally involved in the pathogenesis of heart failure EXCEPT?

Accepted Answer

Answer reason: Heart failure typically involves decreased cardiac output from myocardial lesion, compensatory vasoconstriction raising peripheral resistance, and RAAS activation causing sodium and water retention—thereby increasing preload. A decrease in preload is not characteristic.

Question 44

All of the following are compensatory mechanisms that occur during the pathogenesis of congestive heart failure EXCEPT?

Accepted Answer

Answer reason: CHF triggers compensatory increases in preload (EDV), sympathetic catecholamines, and RAAS activation. Vagal tone is decreased, not increased, so it is not a compensatory mechanism.

Question 45

Angina pectoris is?

Accepted Answer

Answer reason: Angina pectoris is chest pain from myocardial ischemia, often radiating to the left arm/shoulder and due to coronary disease. Option b describes ventricular fibrillation; option c describes heart failure; therefore a is correct.

Question 46

Which statement best describes sudden cardiac arrest?

Accepted Answer

Answer reason: Sudden cardiac arrest is a sudden loss of effective cardiac output most commonly due to a lethal arrhythmia, causing the heart to stop unexpectedly.

Question 47

Which artery provides oxygenated blood to the brain?

Accepted Answer

Answer reason: The common and internal carotid arteries deliver oxygenated blood from the aorta to the brain. The pulmonary artery carries deoxygenated blood to the lungs, and the hepatic artery supplies the liver.

Question 48

Which portion of the heart receives oxygenated blood?

Accepted Answer

Answer reason: Oxygenated blood from the lungs enters the heart via the pulmonary veins into the left atrium (left auricle).

Question 49

The sinoatrial node is termed the?

Accepted Answer

Answer reason: The sinoatrial (SA) node initiates the heart’s electrical impulses and sets the intrinsic rate, so it is called the natural pacemaker. The AV node and Bundle of His are different conduction structures.

Question 50

Which heart chamber corresponds to central venous pressure (CVP)?

Accepted Answer

Answer reason: CVP reflects right atrial pressure and thus corresponds to the right atrium, indicating venous return and right ventricular preload.

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