These blood vessels are the smallest and most numerous and are composed of a single layer of endothelium.

Name: These blood vessels are the smallest and most numerous and are composed of a single layer of endothelium.
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Capillaries are the smallest and most numerous blood vessels. They are composed of a single layer of endothelium, which allows for the exchange of gases, nutrients, and waste products between the blood and tissues.

These Blood Vessels Are the Smallest and Most Numerous and Are