Question 1

Which of the following best describes the difference between an exocrine gland and an endocrine gland?

Accepted Answer

Exocrine glands secrete their products through ducts to an epithelial surface, while endocrine glands secrete hormones directly into the bloodstream.

Question 2

A patient is diagnosed with a pituitary tumor that causes excessive secretion of ACTH (adrenocorticotropic hormone). Which of the following is the most likely effect on cortisol levels and the feedback mechanism?

Accepted Answer

Cortisol levels will increase, which should normally decrease ACTH secretion via negative feedback, but the tumor overrides this control.

Question 3

Which of the following best explains the Bohr effect in the context of oxygen transport in the blood?

Accepted Answer

An increase in carbon dioxide concentration lowers blood pH, which decreases hemoglobin's affinity for oxygen, facilitating oxygen release to tissues.

Question 4

A person with blood type AB- needs a transfusion. Which of the following blood types can safely be donated to this person?

Accepted Answer

O-

Question 5

Which equation correctly represents the relationship between cardiac output (CO), heart rate (HR), and stroke volume (SV)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 6

A patient is experiencing difficulty with gas exchange in the lungs due to thickened alveolar membranes. Which law best explains the decrease in diffusion rate?

Accepted Answer

Fick's Law

Question 7

Which of the following is a function of the spleen in the lymphatic system?

Accepted Answer

Filtration of blood and removal of old or damaged red blood cells

Question 8

During vigorous exercise, which of the following changes would you expect in the cardiovascular system?

Accepted Answer

Increased heart rate and increased stroke volume

Question 9

Which of the following best describes the role of capillaries in microcirculation?

Accepted Answer

Capillaries are the main site of exchange of gases, nutrients, and wastes between blood and tissues.

Question 10

A patient has a mutation that prevents the production of plasma proteins. Which of the following is a likely consequence?

Accepted Answer

Decreased osmotic pressure in the blood, leading to edema.

Question 11

Which of the following best describes the function of lymph nodes?

Accepted Answer

They filter lymph and provide sites for immune cell activation.

Question 12

Which of the following statements about the relationship between resistance, blood flow, and blood pressure is correct?

Accepted Answer

Blood flow is inversely proportional to resistance, as described by $$Q = \frac{\Delta P}{R}.$$

Question 13

Which of the following is an example of a nonspecific defense in human immunity?

Accepted Answer

Skin acting as a physical barrier to pathogens

Question 14

A patient is unable to produce sufficient erythropoietin. What is the most likely effect on their blood?

Accepted Answer

Decreased red blood cell production, leading to anemia

Question 15

Which of the following best describes the function of the hypothalamic-pituitary axis?

Accepted Answer

It regulates hormone secretion through feedback mechanisms.

Question 16

Which of the following best explains why veins have valves, but arteries do not?

Accepted Answer

Valves in veins prevent backflow of blood due to lower pressure, while arteries have higher pressure that keeps blood flowing in one direction.

Question 17

A patient is exposed to a novel virus. Which type of lymphocyte is primarily responsible for producing antibodies against the virus?

Accepted Answer

B lymphocytes

Question 18

Which of the following best describes the function of the sinoatrial (SA) node in the heart?

Accepted Answer

It acts as the main pacemaker, initiating the electrical impulses that set the heart rate.

Question 19

Which of the following best explains the effect of increased sympathetic nervous system activity on the heart?

Accepted Answer

It increases heart rate and increases contractility.

Question 20

A patient with a blocked thoracic duct would most likely experience which of the following?

Accepted Answer

Accumulation of lymph in tissues, leading to edema

BIO2020 Anatomy & Physiology: Midterm Study Guide

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