Q: Which equation correctly represents the calculation of vital capacity (VC) in pulmonary function tests?

$$\text{VC} = \text{ERV} + \text{VT} + \text{IRV}$$

Q: What is the main mechanism by which carbon dioxide is transported in the blood?

Converted to bicarbonate ion ($$\text{HCO}_3^-)$$

Q: Which of the following equations represents the reaction catalyzed by carbonic anhydrase in red blood cells?

$$\text{CO}_2 + \text{H}_2\text{O} \rightarrow \text{H}_2\text{CO}_3$$

Q: If a person’s tidal volume ($$\text{VT}) is 500 mL $$and their inspiratory reserve volume ($$\text{IRV}) is 3300 mL$$, what is their inspiratory capacity ($$\text{IC}$$)?

$$\text{IC} = 3800\ \text{mL}$$

Q: Which equation represents the net reaction for the dissociation of carbonic acid in red blood cells?

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

Question 1

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

Accepted Answer

Exchange of gases between blood, lungs, and the external environment

Question 2

During inhalation, what happens to the pressure inside the lungs relative to the outside atmospheric pressure?

Accepted Answer

Pressure inside decreases below atmospheric pressure

Question 3

Which equation correctly represents the calculation of vital capacity (VC) in pulmonary function tests?

Accepted Answer

$$	ext{VC} = 	ext{ERV} + 	ext{VT} + 	ext{IRV}$$

Question 4

A patient with hypoxia is most likely experiencing which of the following?

Accepted Answer

Low tissue oxygen levels

Question 5

Which muscle is primarily responsible for increasing the volume of the thoracic cavity during inspiration?

Accepted Answer

Diaphragm

Question 6

What is the main mechanism by which carbon dioxide is transported in the blood?

Accepted Answer

Converted to bicarbonate ion ($$	ext{HCO}_3^-)$$

Question 7

Which of the following equations represents the reaction catalyzed by carbonic anhydrase in red blood cells?

Accepted Answer

$$	ext{CO}_2 + 	ext{H}_2	ext{O} ightarrow 	ext{H}_2	ext{CO}_3$$

Question 8

Which pulmonary function test value represents the amount of air left in the lungs after maximal exhalation?

Accepted Answer

Residual volume

Question 9

If a person’s tidal volume ($$	ext{VT}) is 500 mL $$and their inspiratory reserve volume ($$	ext{IRV}) is 3300 mL$$, what is their inspiratory capacity ($$	ext{IC}$$)?

Accepted Answer

$$	ext{IC} = 3800\ 	ext{mL}$$

Question 10

Which of the following statements about hemoglobin is correct?

Accepted Answer

Hemoglobin binds oxygen to iron ions in its heme units

Question 11

What is the effect of cigarette smoking on lung compliance and resistance?

Accepted Answer

Decreases compliance and increases resistance

Question 12

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

Accepted Answer

Medulla oblongata

Question 13

During external respiration, which direction does oxygen diffuse?

Accepted Answer

From alveoli into pulmonary capillaries

Question 14

Which equation represents the net reaction for the dissociation of carbonic acid in red blood cells?

Accepted Answer

$$	ext{H}_2	ext{CO}_3 ightarrow 	ext{H}^+ + 	ext{HCO}_3^-$$

Question 15

Which of the following is a consequence of anoxia in tissues?

Accepted Answer

Localized tissue damage, such as in heart attacks and strokes

Question 16

What is the primary stimulus for increased respiratory rate during relaxed tidal breathing?

Accepted Answer

High carbon dioxide levels

Question 17

Which pulmonary function test value is calculated as the sum of expiratory reserve volume (ERV) and residual volume?

Accepted Answer

Functional residual capacity (FRC)

Question 18

A patient is hyperventilating. What effect does this have on blood pH?

Accepted Answer

Blood pH increases (alkalosis)

Question 19

Which of the following best describes the chloride shift in red blood cells?

Accepted Answer

Bicarbonate ions move out of RBCs in exchange for chloride ions

Question 20

Which of the following is true regarding the oxygen-hemoglobin saturation curve?

Accepted Answer

It shows the relationship between PO2 and the percentage of hemoglobin bound to oxygen

Respiratory Physiology: Mechanisms of Pulmonary Ventilation, Gas Exchange, and Transport

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