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Capillaries are the smallest unit of the circulatory system. Capillary bed is the network of capillaries supplying the organ. As the capillary bed is permeable, it allows transfer of oxygen and nutrients from circulation into the nearby cells and carbon-di-oxide and waste products from cell back into circulation. The capillaries receive oxygen and nutrients from arterioles and sends carbon-di-oxide and waste products via venules.
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