Question 1

Which of the following best describes the difference between active and passive transport across a cell membrane?

Accepted Answer

Active transport requires energy in the form of ATP, while passive transport does not require energy and relies on concentration gradients.

Question 2

A patient is experiencing muscle weakness due to a lack of acetylcholine at the neuromuscular junction. Which process is most directly affected?

Accepted Answer

The initiation of an action potential in the muscle fiber.

Question 3

Which of the following equations correctly represents the relationship between cardiac output, heart rate, and stroke volume?

Accepted Answer

$$CO = HR 	imes SV$$

Question 4

A person is exposed to a cold environment. Which physiological response is most likely to occur to maintain homeostasis?

Accepted Answer

Vasoconstriction of peripheral blood vessels to reduce heat loss.

Question 5

Which of the following best explains the role of the sodium-potassium pump in maintaining the resting membrane potential of a neuron?

Accepted Answer

It actively transports 3 sodium ions out of the cell and 2 potassium ions into the cell, creating an electrochemical gradient.

Question 6

A patient with diabetes mellitus has elevated blood glucose levels. Which hormone is most directly responsible for lowering blood glucose, and what is its primary mechanism?

Accepted Answer

Insulin; it promotes the uptake of glucose into cells and stimulates glycogen synthesis.

Question 7

Which of the following best describes the function of the sarcoplasmic reticulum in skeletal muscle contraction?

Accepted Answer

It stores and releases calcium ions necessary for muscle contraction.

Question 8

A person inhales deeply and holds their breath. What happens to the partial pressure of carbon dioxide ($$P_{CO_2$}) in $$their blood?

Accepted Answer

$$P_{CO_2$}$$ increases because carbon dioxide is not being exhaled.

Question 9

Which of the following is a correct sequence of events in the generation of an action potential in a neuron?

Accepted Answer

Depolarization, repolarization, hyperpolarization, return to resting potential.

Question 10

Which of the following best describes the function of the glomerulus in the kidney?

Accepted Answer

It filters blood to form a filtrate that enters the nephron.

Question 11

A patient is diagnosed with anemia due to a deficiency in vitamin B12. Which process is most directly impaired?

Accepted Answer

Maturation of red blood cells in the bone marrow.

Question 12

Which of the following best explains the role of surfactant in the lungs?

Accepted Answer

It reduces surface tension in the alveoli, preventing their collapse during exhalation.

Question 13

Which of the following is the correct order of blood flow through the heart, starting from the vena cava?

Accepted Answer

Right atrium → right ventricle → pulmonary artery → lungs → pulmonary vein → left atrium → left ventricle → aorta

Question 14

A person is unable to produce sufficient antidiuretic hormone (ADH). What is the most likely effect on urine output?

Accepted Answer

Urine output will increase due to decreased water reabsorption in the kidneys.

Question 15

Which of the following best describes the function of the parietal cells in the stomach?

Accepted Answer

They secrete hydrochloric acid ($$HCl$$), which aids in digestion and activates pepsinogen.

Question 16

A patient has a mutation that prevents the formation of gap junctions in cardiac muscle. Which of the following is most likely to be impaired?

Accepted Answer

The rapid transmission of action potentials between cardiomyocytes.

Question 17

Which of the following best explains the difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands secrete hormones directly into the bloodstream, while exocrine glands secrete substances through ducts to an epithelial surface.

Question 18

A patient is unable to absorb fats in the small intestine due to a lack of bile salts. Which process is most directly affected?

Accepted Answer

Emulsification of dietary lipids.

Question 19

Which of the following best describes the function of the lymphatic system in the body?

Accepted Answer

It returns excess interstitial fluid to the bloodstream and participates in immune defense.

Question 20

A patient is found to have a deficiency in follicle-stimulating hormone (FSH). Which of the following processes is most likely to be impaired?

Accepted Answer

Development of ovarian follicles in females and spermatogenesis in males.

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