AAMC FL3 C/P #52

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mist.illusionist
Posts: 11
Joined: Mon Jan 28, 2019 9:21 am

AAMC FL3 C/P #52

Post by mist.illusionist » Sun Apr 07, 2019 6:00 pm

AAMC explanation doesn't make sense. I need help walking me through how to get the right answer. Why Av/na and not nav/A??

Thank you
NS_Tutor_Will
Posts: 538
Joined: Fri May 25, 2018 9:15 am

Re: AAMC FL3 C/P #52

Post by NS_Tutor_Will » Mon Apr 08, 2019 7:59 am

Thanks for the question!

This is basically an application of the continuity principle: A1V1 = A2V2

In the first case, we have Av for the area and speed of the blood in the capillary.

In the second case, we have na for the total area of the capillaries (total number * volume of each), and then we're looking to solve for velocity (let's follow the AAMC answer choice convention and call it u).

Thus,

Av = nau

Av / na = u = (A/na)v

I hope this helps clarify it!
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