Bernolli Principle is so confusing? Please help

[scilearner]

I'm so confused with bernoulli principle. Let's say there is a pipe and a constriction in the middle third.

 

1. When fluid moves from greater cross sectional area to less (constriction) how does pressure decrease. I mean more molecules are hitting the walls inside the constricted area shouldn't this increase pressure?

2. Why does velocity of fluid increase? I mean when something is constricted isn't it hard to fluid to go through it, meaning output is less volume.

3. When a blood vessel is constriced there is higher blood pressure? How does Bernoulli explain that. Thanks

[kgettys]

Try Googling the Internet before posting questions!

http://en.wikipedia.org/wiki/Bernoulli's_principle

http://home.earthlink.net/~mmc1919/venturi.html

[scilearner]

Try Googling the Internet before posting questions!

http://en.wikipedia.org/wiki/Bernoulli's_principle

http://home.earthlink.net/~mmc1919/venturi.html

 

Thanks I'm reading the 2nd link. Does blood pressure flow linear to the tube, is it ram pressure?