After blood diffuses across the capillary membrane and perfuses the cells, it:
A. drops off carbon dioxide and returns oxygenated blood to the heart.
B. returns carbon dioxide to the left side of the heart, starting with the veins.
C. forms lactic and pyruvic acids, which are used by the cells to form energy.
D. returns waste products to the right side of the heart, starting with the venules.
Answer: D. returns waste products to the right side of the heart, starting with the venules.
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