Q: Which equation correctly represents Boyle’s Law, and how does it explain pulmonary ventilation?

$$ P \times V = k $$ ; As lung volume increases, pressure decreases, allowing air to flow in.

Question 1

Which of the following best describes the function of the 'mucus escalator' in the respiratory tract?

Accepted Answer

It traps and removes dust and pathogens from the respiratory passages by moving mucus upward toward the pharynx.

Question 2

Which type of epithelium lines the oropharynx, and why is this significant for its function?

Accepted Answer

Stratified squamous epithelium; protects against abrasion from food passage.

Question 3

During external respiration, which sequence correctly describes the layers an oxygen molecule must diffuse through to enter the blood from the alveoli?

Accepted Answer

Alveolar epithelium → fused basement membrane → capillary endothelium

Question 4

Which anatomical difference between the right and left lungs is correct?

Accepted Answer

The left lung has a cardiac notch and two lobes, while the right lung has three lobes.

Question 5

Which equation correctly represents Boyle’s Law, and how does it explain pulmonary ventilation?

Accepted Answer

$$ P 	imes V = k $$ ; As lung volume increases, pressure decreases, allowing air to flow in.

Question 6

A patient is experiencing forced exhalation. Which muscles are primarily involved in this process?

Accepted Answer

Internal intercostals and abdominal muscles

Question 7

Which respiratory volume is defined as the amount of air that can be forcibly exhaled after a normal tidal exhalation?

Accepted Answer

Expiratory reserve volume (ERV)

Question 8

According to Dalton’s Law, how is the partial pressure of a gas in a mixture calculated?

Accepted Answer

By multiplying the total pressure by the percentage of the gas in the mixture: $$ P_{gas} = P_{total} 	imes 	ext{fraction of gas} $$

Question 9

Which of the following best explains why a soda pop foams when opened after shaking, using Henry’s Law?

Accepted Answer

Opening the can decreases the pressure, reducing the solubility of $$ CO_2$ $$ and causing it to escape as foam.

Question 10

Which chemical reaction summarizes the formation of bicarbonate ions in the blood?

Accepted Answer

$$ CO_2$ + H_2O \rightarrow H_2CO_3 \rightarrow H^+ + $$HCO_3$$^- $$

Question 11

A decrease in blood pH causes hemoglobin to release more oxygen. What is this effect called?

Accepted Answer

Bohr effect

Question 12

Which statement best describes the movement of oxygen during internal respiration?

Accepted Answer

Oxygen diffuses from the blood (higher $$ P_{O_2$} ) $$into the tissues (lower $$ P_{O_2$} ).$$

Question 13

Which of the following is NOT a function of the respiratory system?

Accepted Answer

Production of red blood cells

Question 14

Which of the following best describes how oxygen is transported in the blood?

Accepted Answer

Most oxygen is bound to hemoglobin in red blood cells.

Question 15

A patient with a $$ P_{O_2$}  of 60 mm Hg $$has a hemoglobin saturation of approximately 90%. If the $$ P_{O_2$} $$ increases to 100 mm Hg, what happens to hemoglobin saturation?

Accepted Answer

It increases slightly to near 98%.

Question 16

Which of the following correctly traces the path of air from the external environment to the alveoli?

Accepted Answer

Nose → pharynx → larynx → trachea → bronchi → bronchioles → alveoli

Question 17

Which pressure is always lower than atmospheric pressure during normal, quiet breathing to keep the lungs inflated?

Accepted Answer

Intrapleural pressure

Question 18

Which statement best describes the serous membrane of the lungs?

Accepted Answer

It is a double-layered membrane called the pleura, consisting of a visceral and parietal layer.

Question 19

Which of the following best describes the neural control of respiration?

Accepted Answer

The medulla oblongata and pons regulate the rate and depth of breathing.

Question 20

Which of the following statements about fetal hemoglobin (HbF) compared to adult hemoglobin (HbA) is correct?

Accepted Answer

Fetal hemoglobin has a higher affinity for oxygen than adult hemoglobin, allowing efficient oxygen transfer from mother to fetus.

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