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The smallest blood vessels which are one-cell thick are called

This question belongs to General Knowledge Biology
Biology
?

The smallest blood vessels which are one-cell thick, are called ________

Answer & Solution
Correct Answer: Option D
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.
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