Which of the following are common causes of an increase in the drive to breathe, which would increase the sensation of dyspnea? 1. Hypoxemia 2. Acidosis 3. High fever 4. Hypocapnia

a. 1 and 4 only
b. 2 and 4 only
c. 1, 2, and 3 only
d. 2, 3, and 4 only

ANS: D
Increases in the drive to breathe occur with hypoxemia, acidosis, fever, exercise, or anxiety.

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