Blood vessels

Human Anatomy, Physiology, and Medicine. Anything human!

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arsenal12345
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Blood vessels

Post by arsenal12345 » Wed Sep 30, 2009 7:40 am

HI can someone help me with this homework question please
Last edited by arsenal12345 on Mon Oct 05, 2009 6:19 am, edited 1 time in total.

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biohazard
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Post by biohazard » Wed Sep 30, 2009 12:05 pm

Generally, when the area doubles, the pressure halves.
Area of a circle: pi*r^2

Happy calculating!

P.S. Dude, you got some big ass blood vessels. What are you studying, whales? ;)

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mith
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Post by mith » Wed Sep 30, 2009 6:03 pm

Flow = velocity * cross sectional area, technically it's the dot product of the flow component normal to your c-sect area.
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arsenal12345
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Re: Blood vessels

Post by arsenal12345 » Sun Oct 04, 2009 8:45 am

I know flow = Pressure/resistance and Resistance = 1/radius^4

so for 4cm vessel , i got resistance of 3.9x10^-3 and for 1cm vessel i got resistance = 1

so does pressure have to increase by a factor of 256? i'm really not sure on this one

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mith
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Post by mith » Mon Oct 05, 2009 6:19 pm

your resistance formula might be wrong...
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

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