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Prep4USMLE Forum » USMLE Step 1 Forum » Physiology Forum

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4 Posts

canstep1
Forum Junior

Topics: 6
Posts: 39

04/27/04 - 06:33 PM

One cell is 50 æm in diameter whereas another is 100 æm in diameter. It would take an uncharged molecule how long to cross the latter compared to the former.

A. same time
B. twice as long
C. four times as long
D. eight times as long
E. none of the above

Can someone explain the answer?

mjl1717
Forum Hero
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Topics: 958
Posts: 5,463

04/27/04 - 07:45 PM

According to Guyton large particles with the same mass move at lower velocities while smaller particles with same mass move at higher velocities

*k =kinetic energy k=mv2/2 thats mv squared

answer-b

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canstep1
Forum Junior

Topics: 6
Posts: 39

04/27/04 - 08:46 PM

I picked b as well
but the answer is c
there is no explanation to the question
Can someone explain?

mash
Forum Fanatic

Topics: 147
Posts: 1,326

04/27/04 - 09:00 PM

ans is 4 times bcoz
net diffusion is proportional to D*(Co - Ci)
where D = P*A
P is permeability
A is area
if d dm is twice then area wud be 4 times
correct me if im wrong.....

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