Q: Which equation correctly represents the calculation of partial pressure for a gas in a mixture?

$$P_{gas} = \text{Total Pressure} \times \text{Fraction of gas}$$

Question 1

Which of the following best describes the process of external respiration?

Accepted Answer

Exchange of gases between the air in the lungs and the blood.

Question 2

During inspiration, which muscle is primarily responsible for increasing the volume of the thoracic cavity?

Accepted Answer

Diaphragm

Question 3

According to Boyle's Law, what happens to the pressure in the lungs when the volume increases?

Accepted Answer

Pressure decreases

Question 4

Which equation correctly represents Boyle's Law?

Accepted Answer

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

Question 5

What is the most important factor in keeping the lungs from collapsing?

Accepted Answer

Intrapleural pressure

Question 6

If air enters the pleural cavity, what happens to the lung and why?

Accepted Answer

The lung collapses because intrapleural pressure equalizes with atmospheric pressure.

Question 7

During expiration, which action contributes to the movement of air out of the lungs during quiet breathing?

Accepted Answer

Relaxation of the diaphragm

Question 8

Which lung volume is the hardest to measure without advanced instrumentation?

Accepted Answer

Residual volume (RV)

Question 9

Which equation correctly represents the calculation of partial pressure for a gas in a mixture?

Accepted Answer

$$P_{gas} = 	ext{Total Pressure} 	imes 	ext{Fraction of gas}$$

Question 10

A patient with COPD has degraded elastic fibers in their lungs. How would this affect intrapleural pressure and why?

Accepted Answer

Intrapleural pressure would become less negative because less recoil would lead to less inward pull on the pleura.

Question 11

Which equation represents the calculation of total lung capacity (TLC)?

Accepted Answer

$$TLC = TV + IRV + ERV + RV$$

Question 12

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

Accepted Answer

By multiplying the total pressure by the fraction of the gas in the mixture.

Question 13

Which law explains the amount of gas that dissolves in a liquid is proportional to its partial pressure?

Accepted Answer

Henry's Law

Question 14

If the partial pressure of oxygen in the alveoli is 104 mm Hg and in the venous blood is 40 mm Hg, in which direction will oxygen move?

Accepted Answer

From alveoli to venous blood

Question 15

Which of the following best describes the movement of carbon dioxide during internal respiration?

Accepted Answer

CO$$_2$$ moves from the tissues into the blood.

Question 16

Which gradient most directly determines the direction that oxygen and carbon dioxide molecules will move between the air in the alveoli and the blood?

Accepted Answer

The pressure gradient between alveolar air and the blood plasma.

Question 17

Which of the following statements is correct regarding hemoglobin and oxygen transport?

Accepted Answer

Hemoglobin increases the amount of O$$_2 in $$the blood, but it is the gradient between the plasma and the alveoli that determines movement.

Question 18

Which equation represents the calculation of vital capacity (VC)?

Accepted Answer

$$VC = TV + IRV + ERV$$

Question 19

Which of the following best describes the anatomical dead space?

Accepted Answer

Volume of air that does not participate in gas exchange.

Study Guide: The Respiratory System – Lung Physiology, Ventilation, and Gas Exchange

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