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

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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: a. K + leaks out of the cell b. K + leaks into the cell c. Na + leaks out of the cell d. A and C e. B and C 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: a. there is no net flux of K + b. K + will flow out of the cell c. K + will flow into the cell d. Na + will flow out of the cell e. none of the above 4. The most permeant cation at the resting membrane potential is: a. K + b. Na + c. Ca 2+ d. C1 - e. none of the above 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? a. they are triggered in a graded manner due to the amount of transmitter released b. depolarization and repolarization occur via anion diffusion c. they are triggered in an all or none manner due to the voltage dependence of sodium channels d. all of the above e. none of the above 7. Which of the following is not a characteristic of EPSP’s? a. they are all or none in amplitude b. they are produced in dendrites and cell bodies c. they are graded in amplitude d. they decrease in amplitude with distance from the originating synapse e. none of the above 8. An IPSP is produced by: a. depolarization of postsynaptic membrane b. hyperpolarization of postsynaptic membrane c. glutamate d. A and C e. B and C 9. Nicotinic cholinergic receptors are found at the neuromuscular junction, autonomic ganglia and the CNS. Which of the following statements regarding nicotinic cholinergic
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This note was uploaded on 04/01/2008 for the course VPHY 3100 taught by Professor W during the Fall '05 term at University of Georgia Athens.

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

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