5. After a long and boring class (never, of course, Anat & Phys!) in a warm room

Question

5. After a long and boring class (never, of course, Anat & Phys!) in a warm room, Wanda Woozy stands up very quickly. Under normal conditions, which vessels contain most of Wanda's blood volume? What happens to the blood when Wanda stands up quickly? What effects does this have on Wanda's venous return? How does this change in venous return affect Wanda's SV? Is this mainly a change in EDV or ESV? Before any homeostatic mechanisms kick in, what are the effects on Wanda's CO and BP? What receptors respond to changes in CO and BP? What are the homeostatic responses that are involved in maintaining CO and BP?

Explanation / Answer

1)at normal condition cerebral circulation should always be higherthat is cerebral vessel s should contain most ofwanda blood.

2)when wanda stands the blood flow towards her leg increase as peripheral circulation increases.

3)venus return is decreased as blood distends the veins and return is decreased asthere are no valves present.walking ,jumping and running increases venous return.

4)Venou return is suddenly decreased as a result right ventricular preload is decreased and so is the stroke volume as lesser the stroke volume lesser is the caridiac output as according to frank starling mechanism.

5)The change is in edv that is ejection fraction it is the fraction ejected per beat of blood present in ventricles at end of diastole.as venous return is decreased the edv is decreased and so is the cardiac output decreased.

6)the co or cardiac output decrease s and thebloodpressure also decreases due lowerco

7) baroreceptor s are mainly responsible for changes in co and bp

8)The homeostatic response that maintain co and bp are mainly maintain ed by

1.neural regulation-This is achieved by autonomic nerves

2.chemical regulation-this type of regulation is achieved by the endocrine system

3.local regulation-this is achieved by local chemical s and metabolites

4.autoregulation.here blood flows through specific beds it occurs in specific organs where the organs regulate their own blood supply although it is not directly related to co and bp.

2

2.

3)

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