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Redistribution of Blood (Review of vascular system (Vascular system…
Redistribution of Blood
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Sympathetic nerves cause arterioles and precapillary sphincters to vasoconstrict (narrow) and vasodilate (expand), decreasing blood flow to non essential areas and increasing blood flow to working muscles
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During exercise skeletal muscles require more oxygen so more blood needs to be directed to them to meet oxygen demand
Venous return mechanism
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Rapid increase in venous return enables significant increase in stroke volume and therefore cardiac output
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Performer should not eat less than an hour before as with full stomach, blood is redirected to stomach rather than working muscles decreasing performance
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