CHE 2171 Chapter : IMG 0002
Document Summary
Chapter 14 : blood vessels, flow & pressure, pressure gradients in the cardiovascular system, pressure gradients drive flow from high pressure to low pressure. Factors affecting resistance to flow: radius of vessel. In arterioles (and small arteries) - can regulate radius. Length of vessel: viscosity of fluid = , blood viscosity dependent on amount of rbcs and proteins, regulate blood flow by regulating arteriole radius, vasoconstriction, decrease radius increase resistance, vasodilation increase radius decrease resistance. R = total peripheral resistance = tpr co=map/tpr: neural control of map. Integration center = cardiovascular centers in the brainstem: controllers = autonomic nervous system. Effectors = heart and blood vessels: arterial baroreceptors, baroreceptors = stretch receptors, arterial baroreceptors. Aortic arch: baroreceptor reflex in action: hemorrhage, hemorrhage decrease in blood volume, drop in map, baroreceptor reflex quickly compensates for changes in blood pressure. Long-term regulation occurs through renal regulation of blood volume.
