KINE 3012 Lecture Notes - Lecture 24: Vascular Resistance, Baroreceptor, Mean Arterial Pressure
7 Apr 2018
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Flow in the veins = p1-p2/r: p1 is whatever periphery the blood is coming from, and p2 is the right atrium where the blood will end up. What can a ect p1 and p2: sympathetic activity causing venoconstriction. So blood volume a ects p1: muscle pump. This is when muscles, usually in your legs contract just enough to put some pressure on the veins and help push the blood back up to your heart. So the muscle also a ects p1: inspiration every time you breathe your respiratory cycle changes your thoracic cavity pressure. This causes a change in thoracic pressure of a couple of mmhg, which have an a ect on your atria and vena cava since they have very thin walls. When you breathe in your thoracic cavity pressure drops, and this allows the atria and vena cava to expand out into that negative pressure space.
