Question 1

A patient is experiencing muscle weakness and fatigue. Laboratory tests reveal an imbalance in sodium and potassium ions across the cell membrane. Which cellular process is most likely impaired in this patient?

Accepted Answer

Active transport via the sodium-potassium pump ($$\mathrm{Na^+/K^+}$$ ATPase)

Question 2

During a lab experiment, a student observes that red blood cells placed in a hypotonic solution swell and burst. Which principle best explains this observation?

Accepted Answer

Osmosis, where water moves from low solute concentration to high solute concentration

Question 3

A person is exposed to cold temperatures, causing their body to shiver. Which type of feedback mechanism is responsible for this response?

Accepted Answer

Negative feedback

Question 4

Which of the following best describes the relationship between structure and function in human anatomy?

Accepted Answer

Structure determines function, as the shape and arrangement of body parts enable specific physiological roles.

Question 5

A patient with diabetes mellitus has elevated blood glucose levels. Which hormone is primarily responsible for lowering blood glucose, and what is its mechanism of action?

Accepted Answer

Insulin; promotes uptake of glucose by cells and stimulates glycogen synthesis

Question 6

Which equation correctly represents the relationship between pressure, flow, and resistance in the cardiovascular system?

Accepted Answer

$$Q = \dfrac{\Delta P}{R}$$

Question 7

A patient is hyperventilating, causing a decrease in blood $$\mathrm{CO_2$}$$ levels. What effect will this have on blood pH, and why?

Accepted Answer

Blood pH will increase because less $$\mathrm{CO_2$}$$ means less $$\mathrm{H^+} is $$produced.

Question 8

Which of the following best explains why enzymes are essential for metabolic reactions in the human body?

Accepted Answer

Enzymes act as catalysts, lowering the activation energy and increasing reaction rates.

Question 9

A patient is diagnosed with metabolic acidosis. Which of the following laboratory findings would you expect?

Accepted Answer

Blood pH $$\u003c 7.35$$

Question 10

During exercise, skeletal muscle cells increase their uptake of oxygen and glucose. Which cellular organelle is primarily responsible for producing the ATP required for muscle contraction?

Accepted Answer

Mitochondrion

Question 11

A patient presents with symptoms of dehydration. Which laboratory finding would best confirm this diagnosis?

Accepted Answer

Increased plasma osmolality

Question 12

Which of the following best describes the function of hemoglobin in red blood cells?

Accepted Answer

Hemoglobin binds oxygen in the lungs and releases it in the tissues.

Question 13

A patient with chronic kidney disease is unable to excrete sufficient hydrogen ions. What acid-base disturbance is most likely to develop?

Accepted Answer

Metabolic acidosis

Question 14

Which of the following is a correct statement about the homeostatic control of blood glucose?

Accepted Answer

Insulin is released when blood glucose is high, promoting glucose uptake by cells.

Question 15

A patient is found to have a mutation in the gene encoding a membrane channel protein. Which process is most likely to be directly affected?

Accepted Answer

Facilitated diffusion of ions

Question 16

Which of the following best describes the role of buffers in maintaining blood pH?

Accepted Answer

Buffers minimize changes in pH by binding or releasing $$\mathrm{H^+}$$ ions.

Question 17

A patient is experiencing rapid heart rate and low blood pressure after severe blood loss. Which physiological mechanism is most likely activated to restore homeostasis?

Accepted Answer

Increased sympathetic nervous system activity, causing vasoconstriction and increased heart rate

Question 18

Which of the following equations correctly represents the Henderson-Hasselbalch equation for calculating blood pH?

Accepted Answer

$$\mathrm{pH} = \log \left( \dfrac{[\mathrm{$$HCO_3$$^-}]}{0.03 	imes [\mathrm{CO_2$}]} ight)$$

Question 19

A patient with a genetic disorder cannot produce the enzyme lactase. After consuming dairy, they experience abdominal pain and bloating. Which process is impaired?

Accepted Answer

Digestion of lactose into glucose and galactose

Question 20

A person is exposed to a novel virus that attacks helper T cells. Which system will be most directly affected?

Accepted Answer

Immune system

Anatomy & Physiology I: Course Structure, Key Topics, and Laboratory Overview

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