Question 1

Which of the following best describes the difference between the first and second lines of immune defense?

Accepted Answer

The first line consists of physical and chemical barriers, while the second line involves cellular and chemical responses.

Question 2

Which of the following is TRUE regarding antigens in adaptive immunity?

Accepted Answer

Antigens are molecules that elicit an immune response by being recognized as foreign.

Question 3

A patient receives a vaccine for influenza. Which type of immunity is being developed?

Accepted Answer

Active artificially acquired immunity

Question 4

Which statement about antibody classes is CORRECT?

Accepted Answer

Each antibody class has unique structural features and functions, such as IgG being the most abundant in plasma.

Question 5

Which cell type is responsible for activating CD8+ cytotoxic T cells by presenting antigens with MHC Class I molecules?

Accepted Answer

Antigen-presenting cells (APCs)

Question 6

A newborn receives antibodies from its mother through breast milk. What type of immunity is this?

Accepted Answer

Passive naturally acquired immunity

Question 7

Which of the following is a function of cytokines in the immune response?

Accepted Answer

Serving as chemical messengers to regulate immune cell activity

Question 8

Which equation correctly represents the relationship between partial pressure, concentration, and solubility of a gas in a liquid?

Accepted Answer

$$C = k 	imes P$$

Question 9

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

Accepted Answer

Alveolar collapse and difficulty in pulmonary ventilation

Question 10

Which of the following best explains the role of carbonic anhydrase in CO$$_2$$ transport?

Accepted Answer

It catalyzes the conversion of CO$$_2$$ and H$$_2O to $$HCO$$_3^-$$ and H$$^+$$, facilitating CO$$_2$$ transport in blood.

Question 11

Which of the following is TRUE regarding ventilation-perfusion coupling in the lungs?

Accepted Answer

Ventilation and perfusion are matched to optimize gas exchange efficiency.

Question 12

A patient with autoimmune disease is experiencing tissue damage. Which mechanism is most likely responsible?

Accepted Answer

Immune system fails to recognize self-antigens and attacks host tissues.

Question 13

Which of the following is a consequence of hypoxia at the cellular level?

Accepted Answer

Decreased oxygen delivery leading to impaired cellular metabolism

Question 14

Which formula represents the calculation of vital capacity in respiratory physiology?

Accepted Answer

$$VC = TV + IRV + ERV$$

Question 15

A patient is exposed to tuberculosis and develops immunity after recovering. What type of immunity is this?

Accepted Answer

Active naturally acquired immunity

Question 16

Which of the following best describes the process of oxygen loading in the lungs?

Accepted Answer

Oxygen binds to hemoglobin in red blood cells as it diffuses from alveoli into pulmonary capillaries.

Question 17

Which of the following is a characteristic of helper T cells (CD4+)?

Accepted Answer

They activate other immune cells by releasing cytokines.

Question 18

Which equation describes the dissociation of carbonic acid in blood?

Accepted Answer

$$H_2CO_3 \rightarrow $$HCO_3$$^- + H^+$$

Question 19

A patient with acquired immunodeficiency syndrome (AIDS) is most likely to have a deficiency in which cell type?

Accepted Answer

CD4+ helper T cells

Question 20

Which of the following is a common homeostatic imbalance affecting the respiratory system?

Accepted Answer

Asthma

Immunity and Respiratory System: Key Concepts in Anatomy & Physiology

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