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BIO. P1 cie Que.

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sweetie:
Q1. A person has a heart rate of 70beats per min. and a stroke volume of 80cm3?
what is approx. vol. of blood returning to the heart per min. from the left pul. vein only??????

thanx 4 any help :-*

cashem'up:
hey listen........is it....5600

nid404:
Ohk...Stroke volume=80cm3
since the volume is equally divided between the two ventricles, left ventricle will have 40cm3

we're finding partial cardiac output=heart rate X stroke volume of the particular ventricle (dm3)
                                              =70 X 40/1000
                                              = 2.8L/min

tmisterr:
actually stroke volume is the volume pumped out by EACH ventricle in a single beat so there is no need to divide by 2 (plus you can't be sure they are pumping out the same amount of blood since left ventricle has thicker walls) so it will just be 80/1000*70=5.6 dm3  min-1

nid404:
Yes..my bad..it's each ventricle that pumps 80cm3.

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