Student Doctor Network Forums Help on Bernouilli's equation concept
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 07-05-2012, 07:27 AM #1 Member   Status: Pre-Medical Join Date: Jun 2012 Posts: 72 Help on Bernouilli's equation concept So I get that as the pressure increases, the speed decreases according to Bernouilli's principle. But when I was doing passages in Berkeley's Bio book, the questions claim that as you increase the pressure in an artery, the speed (blood flow) also increases? Is this correct or did I get something wrong? Can anyone help explain the relationships between pressure and speed as it occurs in everyday life vs. blood vessels? Thank you!
 07-06-2012, 06:23 AM #2 go nads go!     Status: Pre-Medical Join Date: May 2011 Posts: 1,310 The answer to your question is really complex, but for the mcat you should not associate bernoulli with blood. There are a lot of things about blood that complicate its flow, so just treat it as a special case with its own set of rules. __________________ Engineering freedom!
 07-08-2012, 05:43 PM #3 Senior Member   Status: Pre-Medical Join Date: Sep 2009 Location: California Posts: 515 The way I understand it is that in many artery diseases like atherosclerosis the particular "infected" region does have a lower pressure because of a smaller radius in the arteries and thus a higher Velocity and lower pressure due to bernoulli's, but the main difference comes from the OVERALL BP. Our body has to maintain a certain pressure head in order to provide an adequate cardiac output to our cells. Since the Bp has dropped, our overall BP must rise in order to compensate for this difference.
07-16-2012, 02:00 PM   #4
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Join Date: Jan 2012
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Quote:
 Originally Posted by indianjatt The way I understand it is that in many artery diseases like atherosclerosis the particular "infected" region does have a lower pressure because of a smaller radius in the arteries and thus a higher Velocity and lower pressure due to bernoulli's, but the main difference comes from the OVERALL BP. Our body has to maintain a certain pressure head in order to provide an adequate cardiac output to our cells. Since the Bp has dropped, our overall BP must rise in order to compensate for this difference.
And this makes our heart pump harder and thus can lead to problems down the road...

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