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

AORTA will contain most of blood volume under normal conditions . When wanda stands quickly effects of gravity come into action on venous return because when a person stands ,hydrostatic force cause right atrial pressure to decrease and venous pressure in dependent limbs increase .

This increase pressure gradient for venous return from depending limbs (in this case it is legs ) to right atrium,therefore venous return actually decreases.Ultimately cardiac output and arterial pressure decrease which leads to decrease in entire circulation flow because arterial pressure decrease more than right arterial pressure therefore entire circulation flow decrease.

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