KINE 2011 Lecture Notes - Baroreceptor, Carotid Sinus, Sympathetic Nervous System
29 Mar 2014
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Document Summary
Venous return major determinant in cardiac output based on the fact that we need blood in order to fill ventricles with blood, in order to enlarge the volume of ventricle during diastole so you maintain stroke volume. Factors that affect capacity of blood to return back to heart after it goes through the arterial system. The thing that kidneys do also have major influence over a longer term. Direct link between the amount of blood with the venous return: maintaining pressure gradient also influences venous return. Lower limbs, the skeletal muscles pump to compress the veins and squeeze blood towards the heart, that works in conjection with the valves in the vein which prenvent backflow of the blood. So when you squeeze the veins within the muscle, the blood only has one direction which is towards the heart. The sympathetic nervous system constrict the veins which is called venoconstriction.
