Exchange of materials between blood and surroundings takes place in the capillaries
rather than arteries and veins.
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cause capillaries can reach each and every tisse of your body
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Exchange of materials between blood and surroundings takes place in the capillaries rather than arteries and veins because blood can reach to different body parts via the capillaries only. The capillaries are extremely thin in nature and they can reach even the distant part of the body and helps in exchange of material between the body and blood. Hence capillary are used. it
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