KINE 2011 Lecture Notes - Vascular Resistance, Baroreflex, Baroreceptor
29 Mar 2014
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Document Summary
There is baroreceptor reflex-mediated response,when the baroreceptor reflex is activated it always prompts pns and always inhibits sns. The response we see during severe blood loss, is shutting off baroreceptor reflex- mediated response, from occurring, that allows the body to response the way it does. Haemorrhage situation: there is an acute blood loss. -direct effect: venous return has been reduced, due to loss of vol of blood. Cardiac output is reduced due to drop in the stroke vol. Heart rate is not directly affected by blood loss** Map is determined by co which is dependant on stroke vol and tpr, therefore if. Co is reduced, map will be reduced but tpr is set by vasoconstriction of the arterioles, Arterioles don"t care about blood loss, they are not directly sensing it not affected by blood loss, they are just smooth muscles, (constricting it) that is setting the tpr.
