BIOL 1080 Lecture Notes - Lecture 13: Cardiac Output, Baroreceptor, Skeletal Muscle
Document Summary
Lecture #13 regulation of blood pressure (homeostasis) Pressure is the driving force for blood flow: red = oxygenated, arterial blood, blue = deoxygenated, venous blood. Arterial blood pressure: rearranged, this means map = co x tpr, varies with cardiac cycles arteries. When the ventricles contract, sending blood into the. When the heart relaxes between beats not zero due to the elastic recoil of arterial wall. Relationship between flow, resistance and pressure: flow = pressure / resistance, co = map / tpr. R = total peripheral resistance combined resistance of all blood vessels within the systematic circuit (tpr) Example of blood pressure determinations: the measured bp is shown as sp/dp, map = 1/3 sp + 2/3 dp (resting) E. g. (1/3 x 120) + (2/3 x 80) = 93. 3 mm hg: heart doesn"t spend equal time in systole and diastole. Increased action potential: changes associated with decrease metabolic activity generally cause local vasoconstriction i. e. increases in: Neural control of arteriolar diameter: vasoconstriction.
