Question 1

Which equation best describes the relationship between flow, pressure, and resistance in the respiratory system?

Accepted Answer

$$F = \frac{P}{R}$$

Question 2

During inspiration, what prevents the lungs from collapsing even as the chest wall expands?

Accepted Answer

The negative pressure in the pleural cavity

Question 3

What happens to the pressure inside the lungs when the diaphragm contracts and the thoracic volume increases?

Accepted Answer

Pressure decreases

Question 4

A patient is experiencing a decrease in the diffusion of oxygen molecules into the blood. Which of the following could be a possible cause?

Accepted Answer

Decrease in alveolar surface area

Question 5

Match the following pressures to their definitions: $$P_{CO_2$}$$, $$P_{O_2$}$$, $$P_{atm}$$, $$P_{alv}. $$Which is the partial pressure of oxygen?

Accepted Answer

$$P_{O_2$}$$

Question 6

True or False: Oxygen is more soluble in plasma than Carbon Dioxide.

Accepted Answer

False

Question 7

Gas exchange in the lungs is primarily driven by which of the following?

Accepted Answer

Differences in the partial pressures of gases

Question 8

If the partial pressure of oxygen in arterial blood is $$100\ 	ext{mmHg}$$ and the partial pressure of carbon dioxide is $$40\ 	ext{mmHg}$$, what is the ratio $$\frac{P_{O_2$}}{P_{CO_2$}}$$?

Accepted Answer

$$2.5$$

Question 9

Why does hemoglobin have a higher affinity for oxygen in the lungs compared to the tissues?

Accepted Answer

Higher $$P_{O_2$}$$ and lower $$P_{CO_2$} in $$the lungs

Question 10

Which of the following best explains the Bohr effect?

Accepted Answer

Decreased affinity of hemoglobin for oxygen due to increased $$CO_2$$ and decreased pH

Question 11

A rightward shift in the hemoglobin saturation curve indicates:

Accepted Answer

Decreased affinity for oxygen

Question 12

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

Accepted Answer

As bicarbonate ions in plasma

Question 13

If a patient has a mutation that decreases the function of carbonic anhydrase in red blood cells, what would be the most likely effect?

Accepted Answer

Decreased conversion of $$CO_2 to $$bicarbonate, leading to reduced $$CO_2$$ transport

Question 14

Which of the following is TRUE regarding the Haldane effect?

Accepted Answer

Deoxygenated hemoglobin binds $$CO_2$$ more readily

Question 15

Where is the integrating center for monitoring $$P_{CO_2$}$$ levels in the blood?

Accepted Answer

Medulla

Question 16

If $$P_{CO_2$}$$ increases in the arterial blood, what is the expected physiological response?

Accepted Answer

Increase in breathing rate

Question 17

Which of the following is the correct sequence for the transport of $$CO_2$$ from tissues to the lungs?

Accepted Answer

Tissues $$\rightarrow$$ blood $$\rightarrow$$ bicarbonate $$\rightarrow$$ lungs

Question 18

Which of the following would most likely result in a leftward shift of the hemoglobin saturation curve?

Accepted Answer

Decrease in $$CO_2$$ and increase in pH

Question 19

Which of the following is NOT a function of surfactant in the lungs?

Accepted Answer

Increasing surface tension in alveoli

Question 20

Peripheral chemoreceptors in the aortic and carotid bodies primarily respond to changes in which of the following?

Accepted Answer

Arterial $$O_2$$ concentration

Mechanics of Breathing and Gas Exchange: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards