Question 1

Which of the following best describes the primary function of lymphatic vessels in the human body?

Accepted Answer

They return excess interstitial fluid to the bloodstream and help transport immune cells.

Question 2

A patient has a blockage in their thoracic duct. Which of the following is the most likely consequence?

Accepted Answer

Accumulation of lymph in the lower body, leading to edema.

Question 3

Which of the following statements about lymph nodes is correct?

Accepted Answer

Lymph nodes house lymphocytes and filter lymph to remove pathogens.

Question 4

Which of the following best describes the role of MALT (Mucosa-Associated Lymphoid Tissue)?

Accepted Answer

It guards the body's entryways against pathogens by housing immune cells in mucosal linings.

Question 5

T lymphocytes mature in which organ, and what is the significance of this process?

Accepted Answer

Thymus; it enables T cells to become immunocompetent and self-tolerant.

Question 6

Which of the following is an example of a surface barrier that acts as the first line of defense in the immune system?

Accepted Answer

The acidic pH of the skin inhibiting bacterial growth.

Question 7

A patient is unable to produce sufficient antibodies after vaccination. Which immune cells are most likely malfunctioning?

Accepted Answer

B lymphocytes

Question 8

Which of the following best explains the difference between active and passive humoral immunity?

Accepted Answer

Active immunity results from direct exposure to an antigen, while passive immunity is acquired by receiving antibodies from another source.

Question 9

Which antibody class is most abundant in plasma and is responsible for secondary immune responses?

Accepted Answer

IgG

Question 10

A person inhales air through the nose, which is then warmed, humidified, and filtered. Which structure is primarily responsible for these functions?

Accepted Answer

Nasal cavity

Question 11

According to Boyle's law, what happens to the pressure inside the lungs when the volume of the thoracic cavity increases during inspiration?

Accepted Answer

Pressure decreases, causing air to flow in.

Question 12

Which equation correctly represents Boyle's law as it applies to pulmonary ventilation?

Accepted Answer

$$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$

Question 13

A patient with emphysema has reduced elastic recoil in their lungs. Which of the following best explains how this affects expiration?

Accepted Answer

Expiration becomes more difficult because the lungs cannot recoil effectively.

Question 14

Which of the following best describes the process of gas exchange between the alveoli and pulmonary capillaries?

Accepted Answer

Diffusion of gases down their partial pressure gradients.

Question 15

According to Dalton's law, the total pressure of a gas mixture is:

Accepted Answer

The sum of the partial pressures of each gas.

Question 16

Which equation represents Henry's law, which explains how gases dissolve in liquids such as blood?

Accepted Answer

$$C = kP$$

Question 17

A climber at high altitude experiences hypoxemia. Which physiological response is most likely to occur to compensate for the lower oxygen availability?

Accepted Answer

Increased respiratory rate to enhance oxygen uptake.

Question 18

Which of the following best describes the role of chemoreceptors in the control of respiration?

Accepted Answer

They sense changes in blood levels of $$CO_2$$, $$O_2$$, and pH, and adjust respiratory rate accordingly.

Question 19

A patient with chronic bronchitis has difficulty exhaling air from the lungs. Which of the following best explains why this occurs?

Accepted Answer

Bronchial inflammation increases airway resistance, making expiration more difficult.

Question 20

Which of the following is a correct statement about the transport of oxygen in the blood?

Accepted Answer

Most oxygen is bound to hemoglobin in red blood cells.

Lymphatic and Respiratory Systems: Structure, Function, and Defense Mechanisms

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