midterm2009

midterm2009 - 1 MCDB 111/ Introduction to Physiology -...

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1 MCDB 111/ Introduction to Physiology - Midterm, Winter 2009 Your Name: Perm #: Your TA's name: Discussion section time: 1. (9) ________ 2. (6) ________ 3. (15) ________ 4. (6) ________ 5. (6) ________ 6. (13) ________ 7. (5) ________ 8. (5) ________ 9. (5) ________ 10. (6) ________ 11. (4) ________ total (80) ________ 1. The graph below shows changes of relative ion permeability with respect to time in a nerve cell as it has an action potential. a. Between about 0.5 ms and 1.5 ms the permeability of ion “A” is dropping quickly. What is ion “A” and what is causing the permeability to drop so suddenly? (3 points)
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2 b. Between 0 and about 1.25 ms the permeability of ion “B” is increasing. What is ion “B” and what is the stimulus that is causing the permeability of ion “B” to increase? (3 points) c. At time point 2 ms, would you expect the membrane potential of this nerve cell to be: at the resting potential, more negative than the resting potential (hyperpolarized), or more positive than the resting potential (depolarized). Explain your answer in terms of relative membrane permeability. (3 points)
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3 2. Refer to the picture of the synapse below. The graph shows the membrane potential in the post-synaptic cell. The post-synaptic cell has three pre-synaptic inputs (A, B, and C). The numbers at the top of the graph of membrane potential versus time indicate
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This note was uploaded on 02/14/2011 for the course MCDB 111 taught by Professor Smith during the Spring '11 term at UCSB.

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midterm2009 - 1 MCDB 111/ Introduction to Physiology -...

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