PHSL 3051 Lecture Notes - Lecture 17: Blood Pressure, Capillary, Systolic Geometry
Document Summary
Blood flow (q) in the cardiovascular system is proportional to the pressure gradient ( p) Pressure created by contracting muscles is transferred to blood. Driving pressure ( p) is created by ventricles. Volume changes pressure, increase in stroke volume increases pressure. Flow through a tube depends on the pressure gradient. Higher the pressure gradient, the greater the fluid flow. Resistance, r = 8l / r4, r = radius of vessel. R is proportional to thickness/viscosity of fluid ( ) R is inversely proportional to radius4 (1/r4) Small change in radius has a large effect on resistance to blood flow. Blood flow through a vessel is inversely proportional to resistance. Constricting causes decrease in blood flow (specifically vasoconstriction) Dilation causes increase in blood flow (vasodilation) Mean arterial pressure [ p] = cardiac output (co) [q]* total peripheral. Veins carry blood back to the heart. Arteries carry blood away from the heart. Arteries use smooth muscle to change radius, resistance, pressure.
