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Heart output

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Heart output

Postby victor » Fri Jun 10, 2005 1:45 pm

Hey, does anyone can help me to count heart output if from the question we know the pressure of pulmonary veins and pulmonary arthery? just give me the formula please...
I really shocked that this kind of question appeared in my 1st grade of senior high school 2 years ago....even my teacher can't explained it...
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Postby b_d_41501 » Fri Jun 10, 2005 2:10 pm

Cardiac Output = 2ml x Pulse Pressure x Heart Rate
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Da question

Postby victor » Sun Jun 12, 2005 1:20 pm

well, this is the question:
Heart beat : 70 beats per minute
Pulmonary vein consists of : 0.24 ml O2/ml
Pulmonary arthery consists of : 0.16 ml O2/ml
O2 consumption for the body : 500 ml per minute
How many is the heart output?
a. 1.65 L/minute
b. 4.55 L/minute
c. 5.00 L/minute
d. 6.25 L/minute
e. 8.00 L/minute
This is the question from my exam when I'm still at the first grade of senior high school. Because this can be considered into homework, please just give me the formula..thanks
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Postby b_d_41501 » Sun Jun 12, 2005 2:52 pm

OHHH, Ok, i gotcha now. lol. Ignore the Heart Beat, it's irrelevant. Here's the equation:

V02=Q(Ca-Cv)
V02= Volume of O2 consumed
Q = Cardiac Output
Ca = Arterial volume of O2 per mL of Blood
Cv = Veinous volume of O2 per mL of Blood

Simply solve for Q and convert the mL to L. I did it and got D. Work it yourself and see what you get.
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ok

Postby victor » Mon Jun 13, 2005 11:57 am

Hey...thanks man..you've solved my 2-year pended question... :lol:
By the way...you'd gotten D for that? it's better than me..I?got nothing..even a Z letter :lol:
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Postby b_d_41501 » Mon Jun 13, 2005 2:44 pm

No problem, victor. Human Biology is my specialty since i'm gonna be a Dr. If you have anymore like that, just post'em and i'll help out.
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Umm...

Postby victor » Tue Jun 14, 2005 12:46 pm

Hey, I've count it and got a little bit problem. You said that the equation is:
VO2=Q(Ca-Cv) and I'll input the number
500 = Q (0.24 - 0.16)
500 = Q (0.8)
Q=625 mL/minute.
If we change it into L/minute it will become 0.625 L/minute. Am I wrong. Please apologize since I really cannot do math.. :wink:
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Postby b_d_41501 » Tue Jun 14, 2005 10:35 pm

That is true., hmm.......maybe the choices on the original test were typed wrong, because this is the equation. :?
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Postby MrMistery » Wed Jun 15, 2005 8:33 pm

Actually i calculated it now and it is correct.
If you do 0.24-0.16 you get 0.08 ml of oxygen that is consumed by the body in one journey of the blood from the pulmonary vein to the pulmonary artery(actually the big circulation). So your body consumes 0.08 ml of oxygen for every ml of blood. Since we know it consumes 500 ml os oxygen in one minute, we simply divide 500 by 0.08 and get 6250 ml of blood that is needed for that 500 ml of oxygen. Turning this into litres you get 6.25L/minute, so the correct answer is indeed d.
I am sorry i didn't do it before but it seemed b_d_41501 had done it
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Postby b_d_41501 » Wed Jun 15, 2005 10:13 pm

I realize now the error of my calculation. Thanks Mystery. :D
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thanks

Postby victor » Thu Jun 16, 2005 12:26 pm

Hey, I've just realized it...thanks Andrew.. :lol:
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