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

Boyle’s Law: $$P \times V = k$$; as lung volume increases, pressure decreases, allowing air to flow in.

Question 1

Which of the following best describes the function of the respiratory mucosa in the upper respiratory tract?

Accepted Answer

It traps inhaled particles and pathogens, humidifies air, and contains ciliated cells that help move mucus toward the pharynx.

Question 2

The 'mucus escalator' is essential for respiratory health. What is its primary mechanism?

Accepted Answer

Ciliated epithelial cells move mucus and trapped particles upward toward the pharynx for swallowing.

Question 3

Which region of the pharynx is lined with pseudostratified ciliated columnar epithelium?

Accepted Answer

Nasopharynx

Question 4

During external respiration, which layers must an oxygen molecule cross to move from the alveolus into the blood?

Accepted Answer

Alveolar epithelium, fused basement membrane, capillary endothelium

Question 5

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

Accepted Answer

The right lung has three lobes and is larger than the left lung, which has two lobes and a cardiac notch.

Question 6

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

Accepted Answer

Boyle’s Law: $$P 	imes V = k$$; as lung volume increases, pressure decreases, allowing air to flow in.

Question 7

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

Accepted Answer

Internal intercostals and abdominal muscles

Question 8

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 9

Dalton’s Law states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of each gas. If atmospheric pressure is $$760\ \mathrm{mmHg}$$ and oxygen makes up 21% of air, what is the partial pressure of oxygen?

Accepted Answer

$$160\ \mathrm{mmHg}$$

Question 10

According to Henry’s Law, the amount of gas that dissolves in a liquid is proportional to its partial pressure and solubility. Which scenario best illustrates this law?

Accepted Answer

A soda pop foams when opened after shaking because increased pressure forces more CO$$_2$$ into solution, which escapes rapidly when pressure is released.

Question 11

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

Accepted Answer

Oxygen diffuses from the blood into the tissues because the partial pressure of oxygen is higher in the blood than in the tissues.

Question 12

How is most carbon dioxide transported in the blood?

Accepted Answer

As bicarbonate ions ($$\mathrm{HCO}_3^-) $$formed by the reaction of CO$$_2$$ with water

Question 13

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

Accepted Answer

$$\mathrm{CO}_2 + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{H}_2\mathrm{CO}_3 \rightarrow \mathrm{H}^+ + \mathrm{HCO}_3^-$$

Question 14

A decrease in blood pH (acidosis) affects hemoglobin saturation in which way, and what is this effect called?

Accepted Answer

Hemoglobin releases oxygen more readily; this is called the Bohr effect.

Question 15

Which statement best explains why fetal hemoglobin has a higher oxygen affinity than adult hemoglobin?

Accepted Answer

Fetal hemoglobin has a different structure that allows it to bind oxygen more tightly, facilitating oxygen transfer from maternal blood.

Question 16

Trace the path of an oxygen molecule from the atmosphere to the tissues, indicating the pressure gradient at each step.

Accepted Answer

Atmosphere ($$\approx 160\ \mathrm{mmHg}$$) → alveoli ($$\approx 104\ \mathrm{mmHg}$$) → arterial blood ($$\approx 100\ \mathrm{mmHg}$$) → tissues ($$\approx 40\ \mathrm{mmHg})$$

Question 17

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

Accepted Answer

Production of red blood cells

Question 18

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

Accepted Answer

Intrapleural pressure

Question 19

Which neural structure is primarily responsible for setting the basic rhythm of breathing?

Accepted Answer

Medullary respiratory centers (dorsal and ventral respiratory groups)

Question 20

A scuba diver ascends rapidly from deep water, causing nitrogen gas to come out of solution in the blood. Which law explains this phenomenon?

Accepted Answer

Henry’s Law

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