Question

why capillaries are having small pre structures ?it

Answer 1

capillaries is site for changing gasses and nutrients in the organs.

So,they need this structure to help in diffusion of gasses and nutrients in organs..

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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Hope it helps... ¯\_(ツ)_/¯