Question 1

What is the primary product of photosynthesis that plants use for energy?

Accepted Answer

Answer reason: The main stable energy-rich molecule produced is glucose, which can be metabolized via cellular respiration or stored as starch for later use. Oxygen is primarily a byproduct released from water splitting rather than the energy source. Carbon dioxide is a reactant that is fixed into sugars, while ATP made in the light reactions is used transiently to build sugars and is not the end product used for longer-term energy needs.

Question 2

Intravenous therapies often consist of electrolyte replacement therapies. Select the electrolyte that is accurately paired with one of its functions?

Accepted Answer

Answer reason: Calcium is an essential cofactor in multiple steps of the coagulation cascade, enabling activation of clotting factors and formation of a stable fibrin clot. This makes its pairing with blood clotting physiologically accurate and clinically relevant when considering electrolyte replacement and bleeding risk. Potassium is primarily an intracellular cation that supports membrane potential and neuromuscular function, not extracellular fluid regulation. Chloride is the major extracellular anion involved in osmotic balance and acid–base regulation, so linking it to ICF is incorrect.

Question 3

All sense organs send information to the brain via?

Accepted Answer

Answer reason: Afferent (sensory) neurons carry these impulses via peripheral and cranial nerves to the spinal cord/brain for processing and perception. Hormones and blood are chemical/transport systems and do not provide fast, point-to-point encoding of sensory modality and intensity. Muscles are effectors that respond to neural output rather than being the primary pathway for sensory input.

Question 4

Which part of the body receives no blood?

Accepted Answer

Answer reason: The tongue is highly vascular, with a rich arterial supply supporting muscular activity and taste. Teeth are supplied via the dental pulp and periodontal tissues through branches of the maxillary artery. The eyes also have substantial blood supply (e.g., retinal and ciliary circulations) to support high metabolic demand, so no listed structure is truly bloodless.

Question 5

Water Percentage in plasma is?

Accepted Answer

Answer reason: Standard physiology describes plasma as about 90–92% water by volume, which supports transport and maintains osmotic balance and viscosity. Values like 70% are closer to total body water in some contexts, not plasma composition. Values of 100% or 120% are physiologically impossible for a percentage composition of a component.

Question 6

Other name of water intoxication or water intoxication is related to ...?

Accepted Answer

Answer reason: The lowered serum osmolality drives water into cells, particularly brain cells, causing cerebral edema with symptoms such as headache, confusion, seizures, and coma. This matches hypotonic overhydration rather than isotonic overhydration, which expands extracellular volume without lowering sodium concentration. Hypertonic overhydration implies excess sodium relative to water and would raise osmolality, producing opposite fluid shifts.

Question 7

Which process describes the movement of molecules from high to low concentration?

Accepted Answer

Answer reason: This describes diffusion, where solute particles spread until equilibrium is approached. Active transport is a key distractor because it moves substances against the gradient and requires ATP. Osmosis is a specific type of diffusion involving water across a semipermeable membrane, and endocytosis is vesicular bulk transport rather than gradient-driven particle movement.

Question 8

What is the primary function of the lymphatic system?

Accepted Answer

Answer reason: This prevents edema and supports effective blood volume and pressure. While lymphatics also transport dietary lipids from the intestine (via lacteals) and support immune surveillance, these are secondary compared with its core drainage/return function. Oxygen transport is a role of red blood cells in the cardiovascular system, and hormone production is an endocrine function.

Question 9

The nurse is caring for a client having respiratory distress related to an anxiety attack. Recent arterial blood gas values are pH = 7.53, PaO2 = 72 mm Hg (72 mm Hg), PaCO2 = 32 mm Hg (32 mmHg), and HCO3- = 28 mEq/L (28 mmol/L). Which conclusion about the client should the nurse make?

Accepted Answer

Answer reason: The core principle is ABG interpretation: elevated pH indicates alkalemia, and a low PaCO2 points to a primary respiratory alkalosis. Hyperventilation from anxiety causes excessive CO2 blow-off, lowering PaCO2 and raising pH, which matches these findings. The PaO2 of 72 mm Hg suggests mild hypoxemia, which can accompany anxiety-related tachypnea and ventilation–perfusion mismatch. “Acidic blood” is inconsistent with the alkalemic pH, and “overreacting” is a non-clinical, inappropriate conclusion.

Question 10

Which cells in our body are popularly called "soldiers of the human body"?

Accepted Answer

Answer reason: These cells migrate to sites of injury or infection, participate in inflammation, and coordinate immune responses through phagocytosis and antibody/cytokine-mediated mechanisms. Because they actively protect the body, they are commonly referred to as the “soldiers” of the body. Red blood cells mainly transport oxygen and carbon dioxide, while basophils and eosinophils are only specific subtypes of leukocytes rather than the broad group implied by the question.

Question 11

What is the process by which water moves across a cell membrane?

Accepted Answer

Answer reason: This passive movement of water is termed osmosis and does not require cellular energy (ATP). Diffusion is a broader term for solute movement down a concentration gradient, but the specific term for water movement is osmosis. Active transport and endocytosis are energy-dependent processes used for moving solutes against gradients or bringing in large particles, not for the typical transmembrane movement of water.

Question 12

Which organelle is responsible for generating energy for the cell?

Accepted Answer

Answer reason: Mitochondria house the Krebs cycle and the electron transport chain, which generate the bulk of ATP used for cellular work. Ribosomes synthesize proteins, lysosomes digest cellular debris, and the Golgi apparatus modifies and packages proteins/lipids rather than producing ATP. Therefore the organelle most directly responsible for energy generation is the one specialized for ATP production.

Question 13

Which part of the ear is responsible for balance?

Accepted Answer

Answer reason: The semicircular canals sense angular (rotational) acceleration via endolymph movement that bends hair cells in the crista ampullaris. This provides key input for the vestibulo-ocular reflex and equilibrium. In contrast, the cochlea is specialized for hearing, while the Eustachian tube equalizes middle-ear pressure and the tympanic membrane transmits sound vibrations.

Question 14

What is the primary function of the red blood cells?

Accepted Answer

Answer reason: This function is the primary role of erythrocytes in supporting cellular aerobic metabolism. Fighting infection is mainly performed by white blood cells, not erythrocytes. While blood flow can influence heat distribution, thermoregulation is not the primary purpose of red blood cells.

Question 15

What is the process by which water moves through a plant?

Accepted Answer

Answer reason: This evaporation generates negative pressure (tension) that pulls a continuous column of water upward through the xylem via the cohesion-tension mechanism. This explains whole-plant, long-distance transport from roots to leaves. Osmosis is important for water entering root cells locally, but it does not account for the bulk upward flow through vascular tissue.

Question 16

What is the term for the movement of molecules from high to low concentration?

Accepted Answer

Answer reason: This process does not require cellular energy (ATP) and occurs in gases and liquids and across permeable membranes. Osmosis is a specific type of diffusion referring only to water moving across a semipermeable membrane. Mitosis and meiosis are cell division processes and are unrelated to concentration-gradient particle movement.

Question 17

The powerhouse of the cell is —?

Accepted Answer

Answer reason: This occurs primarily via the Krebs cycle and electron transport chain located in the mitochondrial matrix and inner membrane. Because most ATP for normal cell function is produced there, this organelle is termed the cell’s “powerhouse.” By contrast, the nucleus regulates genetic information, ribosomes synthesize proteins, and the Golgi apparatus modifies and packages proteins.

Question 18

Which of the following parts of the brain controls body temperature and hunger?

Accepted Answer

Answer reason: The hypothalamus contains temperature-regulating nuclei (including the preoptic area) that coordinate heat production and heat loss responses via autonomic output. It also regulates hunger and satiety through hypothalamic nuclei (e.g., lateral hypothalamus and ventromedial/arcuate pathways) and hormonal signals such as leptin and ghrelin. In contrast, the thalamus mainly relays sensory information, and the cerebellum primarily coordinates movement and balance, making them poor fits for these homeostatic roles.

Question 19

The mother of a newborn child calls the pediatrician’s office with concern that her child is often jolted or startled when waking from sleep. What reflex is the mother likely witnessing?

Accepted Answer

Answer reason: It is commonly noticed when infants are awakened or startled by noise or movement, matching the mother’s description. Rooting is a feeding-related reflex elicited by stroking the cheek, Babinski is an upgoing plantar response to sole stimulation, and tonic neck is a postural “fencing” response to head turning. Persistence of a strong Moro beyond early infancy can be abnormal, but its presence in a newborn is expected.

Question 20

The last physiologic function that the client lose during the induction of anesthesia is?

Accepted Answer

Answer reason: Loss of awareness occurs early, and protective airway reflexes such as coughing are blunted as anesthetic depth increases. Spontaneous breathing is maintained until deeper levels when the medullary respiratory center is significantly depressed, making this function the last to be lost. Clinically, this is why ventilation must be closely monitored and airway support is instituted as depth increases, even after the patient is unconscious.

Question 21

A 60-year-old man with diabetes mellitus, hypertension, hyperlipidemia, and chronic renal insufficiency is admitted to the hospital because of lightheadedness. His medications include NPH insulin, amlodipine, and simvastatin. He is allergic to penicillin to which he gets an angioedema. His temperature is 37.1 C (98.8 F), blood pressure is 98/65 mm Hg, pulse is 87/min, and his respiratory rate is 22/min. On exam, he is ill appearing. His cardiac rhythm is regular and breath sounds are clear bilaterally. His abdominal exam is benign. A chest radiograph shows clear lungs. An electrocardiogram shows a sinus rhythm with peaked T waves. Laboratory studies show a serum sodium of 134 mEq/L, glucose of 98 mg/dL, and potassium of 6.2 mEq/L. The most appropriate intervention at this time is?

Accepted Answer

Answer reason: Insulin rapidly shifts potassium into cells by stimulating the Na+/K+-ATPase, and concomitant dextrose prevents iatrogenic hypoglycemia, especially since the serum glucose is normal. Oral glucose alone will not correct the potassium and is too slow/inadequate for ECG-evident hyperkalemia. Oral furosemide may promote renal potassium excretion but is slower, depends on kidney function (he has chronic renal insufficiency), and does not address the immediate electrical risk; lactated Ringer’s contains potassium and can worsen hyperkalemia.

Question 22

Which of the following is a type of tissue that contracts and produces movement?

Accepted Answer

Answer reason: This contractile function is the defining property of muscle tissue (skeletal, cardiac, and smooth), allowing locomotion, pumping blood, and peristalsis. Epithelial tissue mainly provides lining, secretion, and absorption rather than force generation. Nervous tissue conducts electrical impulses to coordinate activity but does not itself produce movement by contracting.

Question 23

A plant cell shrinks when placed in?

Accepted Answer

Answer reason: In a hypertonic external solution, the surrounding fluid has a higher solute concentration than the plant cell sap, so water exits the cell. Loss of intracellular water decreases turgor pressure and causes the protoplast to pull away from the cell wall (plasmolysis), producing shrinkage. In hypotonic solutions or pure water, water enters and the cell becomes turgid rather than shrinking, while isotonic conditions produce no net size change.

Question 24

Amount of water excreted as urine per day is about?

Accepted Answer

Answer reason: In a typical hydrated adult, a commonly cited approximate daily urine volume is about 1500 mL. Values like 100 mL/day would indicate severe oliguria/anuria, and 500 mL/day suggests oliguria, both abnormal for most adults. 1000 mL/day can occur but is less representative of the standard average used in physiology exam questions.

Question 25

What is the process by which the body maintains a stable internal environment?

Accepted Answer

Answer reason: This concept directly describes regulation of temperature, pH, glucose, blood pressure, and fluid balance to maintain internal stability. Metabolism refers to chemical reactions for energy use and biosynthesis, not the stability-maintaining control process itself. Adaptation is longer-term adjustment to environment and is broader than the moment-to-moment internal regulation being asked.

Question 26

What is the term for the movement of molecules from high to low concentration?

Accepted Answer

Answer reason: This is the defining feature of diffusion and explains how many solutes and gases distribute across fluids and membranes. Osmosis is a specific type of diffusion referring only to water moving across a semipermeable membrane. Active transport and endocytosis are energy-dependent mechanisms used to move substances against gradients or via vesicular uptake, respectively.

Question 27

Which part of the brain regulates body temperature?

Accepted Answer

Answer reason: The hypothalamus acts as the body’s “thermostat,” sensing blood temperature and coordinating heat-loss (sweating, vasodilation) and heat-gain (shivering, vasoconstriction) responses. It also mediates fever by resetting the temperature set point in response to pyrogens via prostaglandin pathways. By contrast, the cerebrum primarily handles higher cognition and voluntary actions, and the medulla mainly regulates vital autonomic functions like respiration and heart rate rather than temperature set-point control.

Question 28

What is the term for the movement of molecules against a concentration gradient?

Accepted Answer

Answer reason: This distinguishes it from diffusion and osmosis, which are passive processes that occur down a concentration gradient without cellular energy expenditure. Passive transport is an umbrella term for gradient-driven movement and therefore cannot describe movement against the gradient. A classic physiologic example is the sodium-potassium ATPase maintaining resting membrane potentials by pumping ions against their gradients.

Question 29

What is the normal Intracranial pressure?

Accepted Answer

Answer reason: Typical resting values are about 5–15, and sustained elevations above ~20 are treated as intracranial hypertension. This range best matches expected physiologic measurements used in neuro monitoring. The higher ranges listed would more likely indicate pathologic elevation rather than normal baseline.

Question 30

What is the term for the movement of substances across a cell membrane without using energy?

Accepted Answer

Answer reason: This umbrella term includes simple diffusion, facilitated diffusion, and osmosis, all of which occur without direct energy expenditure. The stem asks for the general term rather than a specific subtype, making this the best match. A common distractor is active transport, which by definition requires energy to move substances against a gradient.

Question 31

A nurse is caring for a client with the following arterial blood gases: HCO3 of 18 mEq (22–26), CO2 of 28 mmHg (35–45). Which of the following pH values and acid base imbalances would accompany these values?

Accepted Answer

Answer reason: The CO2 is also low, which is the expected respiratory compensation (hyperventilation) to blow off acid and raise pH toward normal. Since the primary abnormality is decreased bicarbonate, the accompanying pH would be decreased (acidemia) rather than elevated. Respiratory acidosis would require an elevated CO2, which is not present here.

Question 32

The nurse is caring for a client with several broken ribs. The client is most likely to experience what type of acid-base imbalance?

Accepted Answer

Answer reason: Increased PaCO2 shifts the carbonic acid–bicarbonate buffer toward more hydrogen ions, lowering pH and producing respiratory acidosis. This is the most direct and likely acid–base effect of impaired ventilation in thoracic trauma. Anxiety-related hyperventilation can occur, but sustained hyperventilation is less typical than guarded, shallow breathing when rib pain is significant.

Question 33

Which phenomena is defined as a subjective human experience that is what the client says it is, it exists when the client says it is present. Does it alert humans to actual or potential bodily tissue damage?

Accepted Answer

Answer reason: Pain is classically defined as whatever the experiencing person says it is and existing whenever they say it does, emphasizing its subjective nature. It is also a protective physiologic phenomenon that serves as a warning signal of actual or potential tissue damage (nociception) and prompts avoidance or care-seeking behaviors. Anxiety and fear are emotional states related to perceived threat, but they are not defined by the tissue-damage warning function. Perception is a broad cognitive process and is not the specific clinical phenomenon described by this standard definition.

Question 34

The nurse is discussing biological clocks with another nurse. What term is used to describe a human's innate biological clock relating to daytime and nighttime wakefulness and activity?

Accepted Answer

Answer reason: Circadian rhythms are endogenous ~24-hour cycles that regulate the sleep–wake pattern and daily fluctuations in alertness, core temperature, and hormone secretion. The question asks for the innate biologic clock governing day–night wakefulness, which is the definition of circadian rhythm (driven by the suprachiasmatic nucleus and influenced by light). REM sleep is a specific sleep stage rather than the overarching timing system that schedules sleep and wake. Diurnal and nocturnal describe patterns of activity (day-active vs night-active) but do not specifically name the internal clock mechanism.

Question 35

Which of the following is responsible for oxygen transport in human blood?

Accepted Answer

Answer reason: This allows large amounts of oxygen to be carried from the lungs to tissues while keeping dissolved plasma oxygen relatively low. Myoglobin mainly stores oxygen within muscle cells rather than transporting it through circulation. Leukocytes and plasma proteins have immune and oncotic/transport functions, but they are not the principal carriers of oxygen.

Question 36

What is the term for the movement of molecules from high to low concentration?

Accepted Answer

Answer reason: This describes how gases like oxygen and carbon dioxide move across alveolar-capillary membranes and how many solutes spread in fluids. Osmosis is a specific type of diffusion limited to water moving across a semipermeable membrane, so it is narrower than the stem’s general “molecules” wording. Active transport and endocytosis are energy-dependent processes and are not defined by movement from high to low concentration.

Question 37

Which organelle is known as the "powerhouse" of the cell because it generates most of the cell's supply of ATP?

Accepted Answer

Answer reason: This organelle contains the electron transport chain and ATP synthase, which generate the majority of ATP in most human cells. The nucleus mainly stores genetic material and regulates transcription, while ribosomes synthesize proteins and the Golgi modifies/packages proteins for transport. Therefore, the organelle responsible for most ATP generation is the mitochondrion.

Question 38

Which process involves the movement of molecules against their concentration gradient?

Accepted Answer

Answer reason: This is the defining feature of transport from lower concentration to higher concentration to maintain cellular homeostasis (e.g., Na+/K+ ATPase). Diffusion and osmosis are passive processes that move substances down their gradients without energy expenditure. “Passive transport” is a broad category that explicitly excludes movement against the gradient, making it incorrect here.

Question 39

Which organelle is responsible for synthesizing proteins in both eukaryotic and prokaryotic cells?

Accepted Answer

Answer reason: Prokaryotes lack membrane-bound organelles, but still have 70S ribosomes to produce all cellular proteins. Eukaryotic cells use 80S ribosomes in the cytosol and on rough ER, with additional ribosomes in mitochondria/chloroplasts. In contrast, the Golgi modifies and packages proteins after they are made, and the nucleus is primarily involved in transcription and genetic regulation rather than translation.

Question 40

Which organelle is known as the "suicide bag" of the cell because it contains digestive enzymes?

Accepted Answer

Answer reason: If their membrane ruptures or enzymes are released inappropriately, these enzymes can digest cellular components, leading to autolysis—hence the nickname “suicide bag.” Mitochondria primarily generate ATP and regulate apoptosis signaling but are not the main storage site of digestive enzymes. The Golgi apparatus modifies and packages proteins, while the nucleolus is involved in rRNA synthesis and ribosome assembly.

Question 41

Which organelle is responsible for synthesizing lipids and detoxifying poisons in the cell?

Accepted Answer

Answer reason: Its lack of ribosomes reflects that it is not primarily involved in protein synthesis. Rough ER is the main site of synthesis for secreted and membrane proteins, not lipid detox functions. Golgi mainly modifies and packages proteins/lipids for transport, and lysosomes perform intracellular digestion rather than detoxification and lipid production.

Question 42

Which of the following is the function of the human liver?

Accepted Answer

Answer reason: It synthesizes and secretes bile, which is essential for emulsification and absorption of dietary lipids. It is a central site for lipid metabolism (e.g., fatty acid oxidation, lipoprotein synthesis, and cholesterol/bile acid handling) and for carbohydrate metabolism (e.g., glycogenesis, glycogenolysis, and gluconeogenesis) to maintain blood glucose. Because each listed function is a recognized hepatic role, the inclusive choice is the most accurate.

Question 43

What is the primary purpose of Mitosis?

Accepted Answer

Answer reason: This supports organismal growth and replacement of worn-out or damaged cells during tissue maintenance and wound healing. In contrast, producing gametes and reducing chromosome number by half are defining purposes of meiosis, not mitosis. Genetic diversity primarily arises from meiotic recombination and independent assortment, which do not occur in standard mitotic division.

Question 44

Which organelle is known as the "post office" of the cell because it packages and ships proteins?

Accepted Answer

Answer reason: The Golgi complex modifies, sorts, and packages proteins into vesicles for secretion or delivery to specific intracellular destinations, analogous to a cell’s shipping center. Proteins synthesized on ribosomes enter the rough ER first for initial folding and processing, then are transported to the Golgi for further maturation (e.g., glycosylation) and labeling. Mitochondria primarily generate ATP, and lysosomes are degradative organelles that digest macromolecules rather than export them. Therefore, the organelle responsible for packaging and “shipping” proteins is the Golgi apparatus.

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What is the primary product of photosynthesis that plants use for energy?

Intravenous therapies often consist of electrolyte replacement therapies. Select the electrolyte that is accurately paired with one of its functions?

All sense organs send information to the brain via?

Which part of the body receives no blood?

Water Percentage in plasma is?

Other name of water intoxication or water intoxication is related to ...?

Which process describes the movement of molecules from high to low concentration?

What is the primary function of the lymphatic system?

The nurse is caring for a client having respiratory distress related to an anxiety attack. Recent arterial blood gas values are pH = 7.53, PaO2 = 72 mm Hg (72 mm Hg), PaCO2 = 32 mm Hg (32 mmHg), and HCO3- = 28 mEq/L (28 mmol/L). Which conclusion about the client should the nurse make?

Which cells in our body are popularly called "soldiers of the human body"?

What is the process by which water moves across a cell membrane?

Which organelle is responsible for generating energy for the cell?

Which part of the ear is responsible for balance?

What is the primary function of the red blood cells?

What is the process by which water moves through a plant?

What is the term for the movement of molecules from high to low concentration?

The powerhouse of the cell is —?

Which of the following parts of the brain controls body temperature and hunger?

The mother of a newborn child calls the pediatrician’s office with concern that her child is often jolted or startled when waking from sleep. What reflex is the mother likely witnessing?

The last physiologic function that the client lose during the induction of anesthesia is?

Which of the following is a type of tissue that contracts and produces movement?

A plant cell shrinks when placed in?

Amount of water excreted as urine per day is about?

What is the process by which the body maintains a stable internal environment?

What is the term for the movement of molecules from high to low concentration?

Which part of the brain regulates body temperature?

What is the term for the movement of molecules against a concentration gradient?

What is the normal Intracranial pressure?

What is the term for the movement of substances across a cell membrane without using energy?

A nurse is caring for a client with the following arterial blood gases: HCO3 of 18 mEq (22–26), CO2 of 28 mmHg (35–45). Which of the following pH values and acid base imbalances would accompany these values?

The nurse is caring for a client with several broken ribs. The client is most likely to experience what type of acid-base imbalance?

Which phenomena is defined as a subjective human experience that is what the client says it is, it exists when the client says it is present. Does it alert humans to actual or potential bodily tissue damage?

The nurse is discussing biological clocks with another nurse. What term is used to describe a human's innate biological clock relating to daytime and nighttime wakefulness and activity?

Which of the following is responsible for oxygen transport in human blood?

What is the term for the movement of molecules from high to low concentration?

Which organelle is known as the "powerhouse" of the cell because it generates most of the cell's supply of ATP?

Which process involves the movement of molecules against their concentration gradient?

Which organelle is responsible for synthesizing proteins in both eukaryotic and prokaryotic cells?

Which organelle is known as the "suicide bag" of the cell because it contains digestive enzymes?

Which organelle is responsible for synthesizing lipids and detoxifying poisons in the cell?

Which of the following is the function of the human liver?

What is the primary purpose of Mitosis?

Which organelle is known as the "post office" of the cell because it packages and ships proteins?

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