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  #1  
Old 01-21-2014
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Question Question Membrane Potential - Physiology

CHOICES:
a) A
b) B
c) C
d) D
e) E

ANSWER IS C

Please someone help me understand this,
if BOTH positive charges conductances (efflux of the ions) that are inside the cell are increased by the 1000 fold shouldnt it make the cell more NEGATIVE?? i chose D for that matter. which is wrong.
please kindly someone explain
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  #2  
Old 01-21-2014
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Correct Answer

It's not about the 2 ions being positive , it's about their relationship to membrane potential , check the graph , both are equidistal from the membrane potential but in opposite directions , so their sum is current membrane potential , if you increase the force 1000 time , it will be the same relatively to the membrane.
Suppose that theoretically , EQ+ is 6 , ER- or E memb is 4 and ES+ is 2.
Multiply them by 1000 .. so EQ+ 6000 , ES+ is 2000 so the Ememb would be 4000 ... which is path C.
Remember it is all relative to each other .
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Old 01-22-2014
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Thank you.. im kinda weak in this area..

do you think this is high yield for step1?
thanks in advance
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Old 01-22-2014
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I can't say for sure whether it is a high yield or not cause i haven't been to UW physiology questions .
You can read Costanzo Physiology or BRS Physiology , they are great in explaining concepts.
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Old 02-07-2014
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Quote:
Originally Posted by Dr.MMA View Post
I can't say for sure whether it is a high yield or not cause i haven't been to UW physiology questions .
You can read Costanzo Physiology or BRS Physiology , they are great in explaining concepts.
tHANK YOU, ill get into uworld and if this is mentioned ill go back to BRS
cause i dont quite understand it fully.
thanks for your advice!!
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