which of the following best describes a capillary?
A. smallest of the blood vessels; carries oxygen to the body cells
B. one-cell thick, brings carbon dioxide to the body cells
C. several cell layers thick; carries oxygen to the body cells
D. smallest blood vessels; carries carbon dioxide to the body cells
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Answer:
A. smallest of the blood vessels; carries oxygen to the body cells
Explanation:
A capillary is a small blood vessel from 5 to 10 micrometres (μm) in diameter, and having a wall one endothelial cell thick. They are the smallest blood vessels in the body: they convey blood between the arterioles and venules.