A patient has severe pneumonia, which has thickened the respiratory membrane. Despite oxygen therapy, he still has rapid respiration and feels as if he is not getting enough air. This is because
A. O2 cannot diffuse across the thickened membrane.
B. his blood pH increased and stimulated an increase in his respiratory rate.
C. the O2 increases the stimulation of the carotid and aortic bodies.
D. even though he is receiving enough O2, CO2 and H+ accumulate in his blood and cause the respiratory rate to continue to increase.
E. the O2 stimulates the respiratory center to increase the respiratory rate.
Answer: D
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