MATH 110 Midterm: Exam 3A Solutions Spring 2004
14 Mar 2019
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This figure shows a voltage-clamp experiment in which the membrane potential is set at voltages from -26 mv to +65 mv. A greater number of voltage-gated na channels open in response to the larger depolarization. This question demands that you know the early inward current is carried by na. Most of you knew it was opening of voltage-gated na channels that was responsible for the early inward current, but some of you failed to answer the question, why is it bigger at 0 mv than -26 mv. That was the question we asked you to answer. And some of you said the current flow increased because the driving force on na was greater at 0 mv than at -26 mv. Driving force for k increases with each greater step in depolarization. Btw, you folks do not want us to compose a multiple choice exam.
