Question

Why capillaries are narrow in structure ?

Answer 1

hey mate here is your answer..
Capillaries are the site at which exchange of oxygen, carbon dioxide and nutrients takes place. Thestructure of capillaries makes them very well suited for this function. Ascapillaries are only one cell thick and have very thin permeable walls this means that substances can diffuse out of them very easily.

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Answer 2

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Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them. They help to connect your arteries and veins in addition to facilitating the exchange of certain elements between your blood and tissues.

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