After hyperventilating for several minutes, a person may develop short periods of apnea because
A. oxygen in the lungs has not had time to diffuse into the blood.
B. blood pH would drop and inhibit inspiration.
C. blood pH will rise and stimulate expiration.
D. the level of oxygen has increased and inhibits the inspiratory center.
E. the level of CO2 decreases below the level necessary to stimulate the inspiratory center.
Answer: E
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