## Cardiac Output

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rave264
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### Cardiac Output

my teacher gave us this question, and we answered it in class, but i still don't understand it.here's it:

using this formular, explain why marathon runners have a significant heart rate? Cardiac Output = (heart rate)(stroke volume)

rosebud
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Cardiac output is a measure of the blood flow through the heart to the systematic and pulmonary circulation.

Heart rate is the number of beats per minute.

Stroke volume is the amount of blood pumped out of one ventricle of the heart as a result of a contraction.

Using this formula you would be able to calculated the the heart rate for a marathon runner. Marathon runners need more oxygen to keep going and so they are said to have larger hearts on the left side. This could cause a significant heart rate.

Hope it helps

mith
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Actually, runners have a much lower heart rate because their hearts are stronger, more blood is pumped per stroke and their lungs are very efficient...ever notice how they don't really breath that hard?
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rosebud
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sorry

MrMistery
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Lance Armstrong's heart only beats 40 times a second And his heart IS 30% LARGER!!!
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

victor
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Hey, seeing the title reminds me of pattern that Brian gave me in counting cardiac output.
Vol. O2 = Q (Vp-Ap)
Q = cardiac output
Vp = pulmonary vein
Ap = pulmonary arthery
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rave264
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thanks a lot guys. that helps.
biology is my fav subject

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