Biology-Online • View topic - Calculating Blood Flow

## Calculating Blood Flow

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### Calculating Blood Flow

Hi,

I'm trying to calculate blood flow in a leg at rest. If anyone can help, I'd really appreciate it.

I know that Q(or F)=P/R=VA=ml/min (through an individual blood vessel).
However, I'm not given the blood vessel pressure, resistance, etc.

I'm given the following information:

O2 consumption by tissues of leg= 25ml O2/ minute
O2 concentration in pulmonary artery= 190ml O2/ 1000mL blood
O2 concentration in femoral (into leg) artery= 190ml O2/ 1000mL blood
O2 concentration in femoral (out of leg) vein= 140ml O2/ 1000mL blood
HR= 80 beats/minute
End Diastolic Volume=125mL
Ejection Fraction=40%
Diastolic Blood Pressure= 80mm Hg
Systolic Blood Pressure= 120mm Hg

Just by looking at the units I need to get Q (blood flow= ml/min) it seems that I would use

O2 consumption by tissues of leg= 25ml O2/ minute
O2 concentration in femoral (into leg) artery= 190ml O2/ 1000mL blood
O2 concentration in femoral (out of leg) vein= 140ml O2/ 1000mL blood

and manipulate these variables to get the units I want ((1000/(190+140))x25)....but I'm not sure and would really like to know if I'm on the right track or not (I've looked all over the web and haven't found anything that has helped me yet...).

If that's not right, please let me know. And if you know a way to get me to think about this question in a better way and do it right, please let know.

Thanks a lot for any help that anyone can give me ahead of time!
ScienceAnon
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