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BIOC63H3 (38)
Lecture 8

lecture 8

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University of Toronto Scarborough
Biological Sciences
Ivana Stehlik

The microcirculation and the lymphatic systemFigure 1 Microcirculation and the Lymphatic SystemThe microcirculation comprises the smallest arterioles and the exchange vessels including the capillaries and the postcapillaries venules Then transfer of gases water nutrients waste materials and other substances between the blood and body tissues carried out by the exchange vessels is ultimate function of the cardiovascular system Organization of the microcirculationBlood enters the microcirculation via small arterioles the walls of which contain smooth muscle cells These vessels are densely innervated by the sympathetic system particularly in the splanchnic and cutaneous vascular beds Sympathetically mediated constriction of each small arteriole reduces the bloodflow to many capillariesIn some cases tissues eg mesentery capillaries branch form thoroughfare vessels which run from small arterioles to venules Figure 1a right The proximal arteriolar end of such a vessel is termed metarteriole and it is wrapped intermittently in smooth muscles cells The capillaries have a ring of smooth muscle called a precapillary sphincter at the origin but thereafter lack
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