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Capillaries Capillaries lack smooth muscle, but contraction/relaxation of circular smooth muscle in upstream metarterioles and precapillary sphincters. - ppt video online download
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What is the relationship between the cross sectional surface area and blood speed of the blood capillary? - Quora
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a ) A diagram of a longitudinal section of a blood vessel covered by... | Download Scientific Diagram
Blood vessels - The circulatory system in humans – WJEC - GCSE Biology (Single Science) Revision - WJEC - BBC Bitesize
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