Quiz 2 S09-key

Quiz 2 S09-key - BMED 3100: Systems Physiology Test 2,...

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BMED 3100: Systems Physiology Test 2, February 6, 2009 1 Honor Pledge All students are required, when requested, to attach the following statement to any material turned in for a grade in any course at Georgia Institute of Technology: On my honor, I pledge that I have neither given nor received inappropriate aid in the preparation of this assignment. __________________________________ Signature __________________________________ Name (Printed) Be brief in your answers. Write clearly. Backs of pages will not be graded. Last Name KEY
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BMED 3100: Systems Physiology Test 2, February 6, 2009 2 Multiple Choice: Write the best answer on the line to the right. (2 pts each) 1. The following are all true of the Na + /K + -ATPase pump except: _____ C _____ A. Proper functioning of the Na + /K + -ATPase pump uses most of the cellular ATP. B. The Na + /K + -ATPase pump is electrogenic. C. The Na + /K + -ATPase pump maintains low intracellular potassium concentration and high intracellular sodium. D. The Na + /K + -ATPase pump directly contributes very little to the resting membrane potential. E. At steady state resting potential the Na + /K + -ATPase pump balances out ion flux through channels. 2. A given neuron can _____ E _______ A. be either a presynaptic neuron or a postsynaptic neuron. B. receive information from more than one other neuron. C. transmit information to more than one other neuron. D. simultaneously release more than one type of neurotransmitter. E. do all of these things. 3. Compartments A and B are separated by a membrane that is permeable to K + but not to Cl - . At time zero, a solution of KCl is poured into compartment A and pure H 2 O is poured into compartment B. At equilibrium, ____ E ________ A. the concentration of K + in A will be lower than it was at time zero. B. diffusion of K + from A to B will be equal to the diffusion of K + from B to A. C. there will be a potential difference across the membrane, with side A negative relative to side B. D. the electrical and diffusion potentials for K + will be equal in magnitude and opposite in direction E. All of the choices are correct. 4. In a resting neuron, ____ C _______ A. the plasma membrane is freely permeable to sodium ion. B. the concentration of sodium ion is greater inside the cell than outside. C. the permeability of the plasma membrane to potassium ion is about 50 times greater than its permeability to sodium ion. D. the plasma membrane is completely impermeable to sodium ion. E. None of the choices are true. 5. If the concentration of ATP were depleted in a typical nerve cell, the _____ B _______ A. resting membrane potential would increase (become more negative). B. resting membrane potential would decrease (become less negative). C.
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Quiz 2 S09-key - BMED 3100: Systems Physiology Test 2,...

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