Chapter 19: The Cardiovascular System: Blood Vessels

Circular sphincter muscle bundles are found in T. intima of special veins and arteries of penis, ovary, & uterus. Arteriovenous anastomoses. blood does not always pass from arteries to capillaries and then to veins. direct routes from arterioles to venules, they have thick smooth muscle in T. media . Physiological function: to shunt blood where ... ................
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