Chapter 23, Problem 3CAL

Use the following to answer questions 2–4.

Michelle, age 45, has been smoking for over 30 years. She now is beginning to have trouble breathing. Her physician sent her to have her respiratory function tested. The results showed that she has emphysema, which is characterized by a decreased surface area for alveolar gas exchange.

3. Because physiologic dead space is increased, she would be exhibiting

1. a. increased resistance during inhaling.
2. b. smaller amounts of air entering her lungs.
3. c. harder and deeper breathing that leaves her feeling tired.
4. d. decreased blood PCO₂.