vphy - exam 2 old key - Exam II Fall 2005 Dr Murray 1 For a...

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Exam II - Fall 2005 Dr. Murray 1. For a typical mammalian cell, which of the following statements regarding equilibrium potentials for ions is correct? a. the potassium equilibrium potential (E K ) = -65 mV b. the sodium equilibrium potential (E Na ) = +60 mV c. the potassium equilibrium potential (E K ) = -90 mV d. A and B e. B and C 2. At the resting membrane potential of mammalian cells, which of the following is true: 3. Pathological elevation in plasma K + concentration is termed hyperkalemia. In hyperkalemia when membrane potential (E M ) of cells is more negative (-65 mV) than E K (-55 mV) which of the following is true: 4. The most permeant cation at the resting membrane potential is: 5. Neurons possess the ability to produce an action potential and to conduct electrical impulses. The depolarization phase of the action potential is generated by: a. Na + efflux b. Na + influx c. K + efflux d. K + influx e. none of the above
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6. Which of the following is a characteristic of action potentials? 7. Which of the following is not a characteristic of EPSP’s?
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  • Fall '05
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  • Neurotransmitter, b. c. d.

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