Question 1

Which of the following best describes the main function of the lymphatic system?

Accepted Answer

Returning interstitial fluid to the bloodstream and providing immune defense

Question 2

Which of the following is a key difference between lymph capillaries and blood capillaries?

Accepted Answer

Lymph capillaries are closed at one end, while blood capillaries form continuous loops

Question 3

Which lymphoid organ is responsible for the maturation of T lymphocytes and is most active during childhood?

Accepted Answer

Thymus

Question 4

A patient is exposed to a novel virus. Which immune cell is primarily responsible for presenting viral antigens to helper T cells, initiating the adaptive immune response?

Accepted Answer

Macrophage (acting as an antigen-presenting cell)

Question 5

Which of the following best describes the role of surfactant in the alveoli of the lungs?

Accepted Answer

Decreasing the surface tension to prevent alveolar collapse

Question 6

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 7

Which of the following equations correctly represents Boyle's Law as it applies to pulmonary ventilation?

Accepted Answer

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

Question 8

Which of the following best explains why the partial pressure of oxygen ($$P_{O_2$}) in $$alveolar air is lower than in atmospheric air?

Accepted Answer

Oxygen mixes with residual air and is diluted by water vapor in the alveoli

Question 9

A patient with a genetic deficiency in surfactant production is likely to experience which of the following?

Accepted Answer

Alveolar collapse (atelectasis) due to increased surface tension

Question 10

Which of the following is the primary way carbon dioxide is transported in the blood?

Accepted Answer

As bicarbonate ion ($$HCO_3$$^-$$) in plasma

Question 11

Which immune cell is responsible for producing antibodies during the adaptive immune response?

Accepted Answer

Plasma cell (differentiated B cell)

Question 12

Which of the following best describes the sequence of events during the inflammatory response?

Accepted Answer

Vasodilation, increased permeability, phagocyte migration, tissue repair

Question 13

Which of the following best describes the difference between antigens and antibodies?

Accepted Answer

Antigens are foreign molecules that trigger an immune response, while antibodies are proteins produced by B cells to neutralize antigens

Question 14

Which of the following best describes the process of immunocompetence in lymphocytes?

Accepted Answer

The ability to recognize and bind to a specific antigen

Question 15

A patient receives a vaccine containing inactivated viral particles. Which type of immunity is being induced?

Accepted Answer

Artificial active immunity

Question 16

Which of the following best explains why $$P_{CO_2$} ($$partial pressure of carbon dioxide) is the most important factor regulating breathing under normal conditions?

Accepted Answer

CO$$_2$$ levels affect blood pH, which is detected by central chemoreceptors

Question 17

Which of the following is a characteristic of specific (adaptive) immunity compared to nonspecific (innate) immunity?

Accepted Answer

It has memory and can mount a stronger response upon re-exposure to the same antigen

Question 18

Which of the following best describes the pathway of air during inspiration?

Accepted Answer

Nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles → alveoli

Question 19

Which of the following immune cells is primarily involved in the destruction of virus-infected cells during the adaptive immune response?

Accepted Answer

Cytotoxic T cell

Question 20

A patient is exposed to a bacterial pathogen. Which sequence best describes the steps of the immune response to this pathogen?

Accepted Answer

Physical barrier → inflammation → antigen presentation → activation of T and B cells → antibody production

Comprehensive Study Guide: Lymphatic, Immune, and Respiratory Systems

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