Blood Vessels and Circulation

Blood Vessels and Circulation - Blood Vessels and...

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Blood Vessels and Circulation Local Control of Blood Vessels Blood flow through a tissue is usually proportional to the metabolic needs of the tissue and is controlled by the precapillary sphincters. Nervous Regulation of Blood Vessels The vasomotor center (sympathetic division) controls blood vessel diameter. Other brain areas can excite or inhibit the vasomotor center. Vasomotor tone is a state of partial contraction of blood vessels. The nervous system is responsible for routing the flow of blood, except in the capillaries and precapillary sphincters, and is responsible for maintaining blood pressure. Regulation of Arterial Pressure Mean arterial pressure (MAP) is proportional to cardiac output times the peripheral resistance. Baroreceptor Reflexes o Baroreceptors are sensory receptors that are sensitive to stretch. Baroreceptors are located in the carotid sinuses and the aortic arch. The baroreceptor reflex changes peripheral resistance, heart rate,
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Blood Vessels and Circulation - Blood Vessels and...

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