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Blood Flow

Determinants

QuestionAnswer
What is the equation for Blood Flow? BF = MAP - Venous Pressure/PR
What is Perfusion Pressure? the DIFFERENCE in Perssure
What determines Perfusion Pressure? mainly CHANGES in the MAP
What is the definition of PR? FRICTION of Blood against Aterioles
What 2 factors effect PR? Blood Viscosity, Vasomotor Tone
What 2 factors determine Vasomotor Tone? Sympathetic Action, Hormones on Adrenergic Receptors
What would be the result of INCREASED Sympathetic Activity on ß2 Receptors? DILATION of Coronary & Skeletal Muscle ARTERIOLES
What would be the result of DECREASED Sympathetic Activity on ß2 Receptors? NORMAL Vasomotor Tone on Coronary & Skeletal Muscle Aterioles
What would be the result of INCREASED Sympathetic Activity on Alpha Receptors? CONSTRICTION of GI Tract, Kidneys, & Skin Arterioles
What would be the result of DECREASED Sympathetic Activity on Alpha Receptors? DILATION of GI Tract, Kidneys, & Skin Arterioles
Where are ß1 Receptors located? only in the Heart, only for Parasympathetic
What would be the result of having all dilated Arterioles? Anagalactic Shock = faint
What is the significance of Vasoconstriction? Thermoregulatiion, Venous return
An increase in MAP would have what effect on BF? INCREASE blood flow
An increase in PR would have what effect on BF? DECREASE in blood flow
Created by: Kristel