Question

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what is the primary purpose of capillaries?
a regulating blood flow into the tissue capillaries.
b returning blood to the heart.
c the exchange of materials between the blood and tissue cells.
d transporting blood away from the heart.

Explanation:

Capillaries are the smallest blood vessels. Their thin walls allow for the diffusion of oxygen, nutrients, carbon - dioxide, and waste products between the blood and tissue cells. This exchange function is their primary purpose.

Answer:

C. The exchange of materials between the blood and tissue cells.