BIO-0014 Study Guide - Quiz Guide: Vascular Resistance, Carotid Sinus, Mean Arterial Pressure
20 Apr 2017
School
Department
Course
Document Summary
Clamping of common carotids prevents blood from getting to carotid sinus. Afferent information not being sent to central nervous system. Action potentials to afferent nerves close to none- Central nervous system perceives this as a very low blood pressure- increases, stroke volume increases, cardiac output increases, total peripheral resistance increases, blood pressure increases. Sa node discharge increases, heart rate increases, ventricular strength. Stroke volume decreases during hemorrhage, then corrects to slightly below original stroke volume. Cardiac output decreases during hemorrhage, then corrects to slightly below original cardiac output. Efferent sympathetic pathway cause smooth muscles around arterioles and veins to contract. Mean arterial pressure decreases during hemorrhage, then corrects to slightly below original cardiac output. Carotid sinus detects lower blood pressure, fewer action potentials through afferent system to brainstem. Blood flow in brain: decreases then returns to normal levels. Blood flow in gi: decreases during hemorrhage then decreases in compensation. Increase cardiac output (increase heart rate and stroke volume)
