Question 1

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

Accepted Answer

They collect excess interstitial fluid and return it to the bloodstream.

Question 2

A patient presents with swollen lymph nodes in the neck. Which of the following best explains the physiological reason for this swelling?

Accepted Answer

Lymph nodes are filtering pathogens and increasing lymphocyte production.

Question 3

Which of the following is a key difference between diffuse and follicular lymphoid tissue?

Accepted Answer

Follicular lymphoid tissue contains germinal centers for B cell proliferation, while diffuse tissue does not.

Question 4

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

Accepted Answer

MALT guards mucosal surfaces by trapping and destroying pathogens entering through body openings.

Question 5

T lymphocytes mature in which organ, and what is the primary function of this organ?

Accepted Answer

Thymus; provides an environment for T cell maturation and selection.

Question 6

Which of the following is NOT a component of the body's innate (nonspecific) defenses?

Accepted Answer

Antibodies produced by plasma cells.

Question 7

A person is exposed to a new antigen. Which cells are responsible for presenting this antigen to helper T cells to initiate the adaptive immune response?

Accepted Answer

Antigen-presenting cells such as dendritic cells and macrophages.

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 and the production of memory cells, while passive immunity involves receiving antibodies from another source.

Question 9

Which of the following equations correctly represents Boyle's Law, which explains how changes in lung volume affect air pressure during respiration?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 10

During external respiration, which law explains the movement of oxygen and carbon dioxide between alveoli and blood based on partial pressures?

Accepted Answer

Dalton's Law of Partial Pressures

Question 11

A patient with chronic bronchitis has difficulty with gas exchange in the lungs. Which physical property of the respiratory membrane is most likely impaired?

Accepted Answer

Thickness of the respiratory membrane is increased, reducing diffusion efficiency.

Question 12

Which of the following best describes the role of hemoglobin in oxygen transport?

Accepted Answer

Hemoglobin binds oxygen in the lungs and releases it in tissues where $$P_{O_2$} is $$lower.

Question 13

Which of the following factors will increase the rate of oxygen unloading from hemoglobin in tissues?

Accepted Answer

Increased temperature, increased $$P_{CO_2$}$$, and increased BPG.

Question 14

Which of the following is a correct statement about the neural control of breathing?

Accepted Answer

The medullary respiratory centers set the basic rhythm of breathing.

Question 15

A climber at high altitude experiences hyperventilation. What is the primary physiological reason for this response?

Accepted Answer

To compensate for lower atmospheric oxygen by increasing oxygen uptake.

Question 16

Which of the following respiratory diseases is characterized by destruction of alveolar walls, leading to decreased surface area for gas exchange?

Accepted Answer

Emphysema

Question 17

Which equation describes the relationship between the partial pressure of a gas and its solubility in a liquid, as explained by Henry's Law?

Accepted Answer

$$C = kP$$

Question 18

Which of the following best explains the process of inflammation as part of the innate immune response?

Accepted Answer

Inflammation increases blood flow and capillary permeability, allowing immune cells to access affected tissues.

Question 19

Which of the following is a function of the upper respiratory system?

Accepted Answer

It warms, humidifies, and filters incoming air before it reaches the lungs.

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

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