A&P II Notes March 1

A&P II Notes March 1 - Anatomy & Physiology II...

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Cardiovascular System cont. There are some circumstances when there is an increase in MAP but we don’t want our body to  do anything about it o During exercise there is an increase in MAP caused by a significant increase in total  cardiac output, slight decrease in TPR because of vasodilation in the skin and muscles  being used during exercise (blood flow to skin helps us to cool down), slight  vasoconstriction occurs in other areas (like digestive system) Allows oxygen to reach muscles and brain because oxygen is needed to produce  ATP for energy, allows for the removal of waste products more efficiently o Mechanism that allows for the maintenance of higher blood pressure in certain instances  – medulla doesn’t make appropriate changes because the cerebral cortex is  communicating with the medulla, so baroreceptor input is overridden (good thing) In disease there is an inability to regulate blood pressure o Hypotension – low blood pressure, affects many young women, main problem is  lightheadedness especially when changing body positions (laying to standing, bending to  upright, etc.), temporary could result from decreased blood volume or a severe allergic 
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This note was uploaded on 04/18/2008 for the course BI 132 taught by Professor Halpern during the Spring '07 term at BC.

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A&P II Notes March 1 - Anatomy & Physiology II...

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