PeripheralResistance.pdf BIOL 2020-002
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This 1 page Class Notes was uploaded by Paige Fairrow-Davis on Tuesday February 23, 2016. The Class Notes belongs to BIOL 2020-002 at Middle Tennessee State University taught by Dr. Vincent Cobb in Winter 2016. Since its upload, it has received 45 views. For similar materials see Human Anatomy & Physiology II in Biology at Middle Tennessee State University.
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Date Created: 02/23/16
Peripheral Resistance A Vessel radius 1 Blood ow F proportional to the fourth power of radius r F u r4 a Arterioles can constrict to 13 of fully relaxed radius Blood Flow amp Velocity A From aorta to capillaries ow 1 for 3 reasons 1 Greater distance traveled more friction to l ow 2 Smaller radii of arterioles and capillaries 3 Farther from the heart greater the total cross sectional area B From capillaries to vena cava ow again 1 Regulation of BP and Flow 2 Large amount of blood forced into smaller channels Regulation of BP and Flow A Local control chemical messengers amp signals 1 Lactic acid in skeletal muscle B Hormonal control regulation of vasoconstriction amp vasodilation plus regulation of blood volume amp viscosity Neural Control of BP and Flow A Brain centers involved that increase blood pressure 1 Stress anger arousal
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