When are the event forums usually updated with next year's events?
I apologize for being really impatient here, but I have a question regarding a question for anyone who has studied the nervous system before from this test: http://highered.mheducation.com/sites/0 ... uiz_2.html
12. If there is an increase in extracellular K+ ion concentration, the result is
A) depolarization of the plasma membrane.
-B) hyperpolarization of the plasma membrane.
C) little, if any, change in the resting membrane potential of the plasma membrane.
According to this site, the answer was A because "Depolarization of the plasma membrane occurs if there is an increase in the extracellular K+ ion concentration. Hyperpolarization would occur if the extracellular K+ ion concentration decreased, not increased."
I chose B because when the extracellular K+ ion concentration increases, the inside of the plasma membrane becomes more negative relative to the outside of the plasma membrane, causing hyperpolarization. Hyperpolarization occurs when the membrane potential becomes more negative. I assumed that the K+ ion concentration inside the cell stayed the same, and the concentrations of other ions also stayed the same. Where have I gone wrong?
I understand that sometimes there are inaccuracies in online tests, but the large majority of the time, I was the one who misinterpreted the question or mixed up the facts.
Thanks in advance!
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