01:377:370 Lecture Notes - Lecture 30: Fick'S Laws Of Diffusion, Cardiac Output, Vasoconstriction
17 Sep 2019
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Document Summary
Arterial blood flow through muscles in pulsatile- enhances blood flow during eccentric actions and/or recovery phase of concentric actions. Centrally mediated constrictor adjustments in vasculature of less important (non- exercising) tissues. Venous return is also vital - muscle and ventilatory pup actions as well as visceral vasoconstriction helps this process when exercise begins and then work together with cardiac output increases during exercise. Very important in upright exercises - gravity would impede return of blood from extremities otherwise. More blood flow after a contraction bc blood is free to flow. Refers to amount of blood pumped by heart in 1 min. Direct fick - criterion standard, but invasive. Average difference between o2 content of arterial and mixed venous blood (a-v o2 difference) Fick equation: q = ((vo2 ml/min)/(a-v o2 difference)) x 100. Large vein injected with known quantity of inert or radioactive dye.
