Chapter 39: Physical Principles of Gas Exchange; Diffusion of Oxygen and Carbon Dioxide Through the Respiratory Membrane

Chapter 39: Physical Principles of Gas Exchange; Diffusion of Oxygen and Carbon Dioxide Through the Respiratory Membrane

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

1. A child has been eating M&Ms (plain) and inhaled one down his airway, blocking his left bronchiole. Which of the following will describe the changes that occur?

Left Lung Alveolar pCO₂       Left Lung Alveolar pO₂          Systemic Arterial pO₂

1. ­                                              ­                                              ­
2. ­                                              ­                                              «
3. ­                                              ¯                                              ¯
4. ­                                              «                                            ­
5. ¯                                              ¯                                              ¯

ANS: C

2. If alveolar pO₂ is 300 mmHg and alveolar pCO₂ is 40 mmHg, what is the piO₂ (humidified inspired pO₂)?

1. 250 mmHg

1. 300 mmHg

1. 350 mmHg
2. 400 mmHg
3. 760 mmHg

ANS: C

3. Match the following with the letter indicating the most appropriate ANS: pO₂ = 116 mmHg, pCO₂ = 27 mmHg.
4. Atmospheric air
5. Alveolar air
6. Blood in the left heart
7. Blood in the right heart
8. Expired air

ANS: E

4. Twin patients, X and Y, both have respirations of 12/min, tidal volumes of 500 mL, and dead space of 100 mL. Patient X decreases the respiratory rate by half, and doubles the tidal volume. Patient Y doubles the respiratory rate and cuts the tidal volume in half. After two minutes, what conditions would best describe their alveolar gases, as compared to normal.

Patient X Alveolar ventilation                                                            Patient Y Alveolar ventilation

Alveolar pO₂               Alveolar pCO₂            Alveolar pO₂               Alveolar pCO₂

1. ­ ¯                                  ­                                  ¯
2. ¯ ­                                  ¯                                  ¯
3. ­ ¯                                  ¯                                  ­
4. ­ ­                                  ­                                  ­
5. ¯ ­                                  ¯                                  ­

ANS: C