KINE 3012 : Lecture 24 Mar 20.pdf
30 Dec 2014
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Increased heart rate due to the loss of blood. Aortic pressure, stimulus that initiate baroreceptor reflex. Normal blood pressure, causing stretch of aorta and activation of baroreceptor nerve endings. Lower blood pressure/dehydrated there is going to be less stretch in the aortic wall. Sympathetic has affects on hr, contractility, venoconstriction *veins stretch and pool in the veins* and vasoconstriction *affects tpr* Baroreceptor reflex is a negative feedback and reacts within seconds, fast responder. Deals with rapid changes of blood activity such as exercise/posture. Respond and keep you alive in certain situations. Only good for increasing mean arterial pressure, but if you reduce so much blood that it cannot increase it anymore *limit to this system* Fluid dynamics of the capillaries, simultaneously with the events of baroreceptors. Immediate drop in blood volume due to hemorrhage. Baroreceptors lead to higher arteriolar vasoconstriction which leads to lower capillary pressure. There won"t be much filtration force, but stronger reabsorption force to increase blood volume.
