For normal gas exchange in the tissues, which of the following is true?

A. Carbon dioxide diffuses into the tissues because the PCO2 is higher in the blood than in the tissues

B. Carbon dioxide diffuses out of the tissues because the PCO2 is higher in the blood than in the tissues

C. Carbon dioxide diffuses into the tissues because the PCO2 is higher in the tissues than in the blood

D. Carbon dioxide diffuses out of the tissues because the PCO2 is higher in the tissues than in the blood

Reveal the answer

D. Carbon dioxide diffuses out of the tissues because the PCO2 is higher in the tissues than in the blood

Content adapted from ClinicalKey Student question bank

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