# BR discrete on Blood flow rate

#### hellocubed

##### Full Member
Releasing adrenaline dilates blood vessels, making it easier for blood to flow. By about what percentage would the diameter of a blood vessel need to increase to raise blood flow by 20%, at constant Blood pressure?

1.) 0%
b.) 4.7%
c.) 10%
d.) 20%

I originally tried to solve this problem using
Q=vr^2
Because nearly all of the previous passages treated blood as an ideal fluid.
But they want us to treat blood as a non-ideal fluid here and use Q=r^4 relationship.

I'm wondering why we assume that blood here is a non-ideal fluid? Is that just a general rule to assume Everything is non-ideal viscous unless we are told otherwise?

##### Full Member
yeah. anytime you see radius or diameter and they want u to say what happens with flow its poiseuille's law.

#### chiddler

##### Full Member
10+ Year Member
i don't think i've ever seen blood as an ideal fluid. blood is nearly always viscous in mcat context.

This thread is more than 9 years old.

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