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Exam 2 Winter 200 - Biology 225 Animal Phys Name Exam 2 Student ID Exam Instructions This exam has 2 parts Put your name and UM ID number on every

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Biology 225: Animal Phys Name: __________________________ Exam 2 Student ID:_______________________ Page 1 of 9 Exam Instructions: This exam has 2 parts. Put your name and UM ID number on every page of this exam. The exam will be separated for grading, and if your name and ID is not on a page you will not receive credit for that page! Part 1: Short answer. Write answers to short answer/essay questions in the space provided. Most questions should require only one to three sentences. Be concise but make sure enough information is provided to answer the question. These questions are worth 50 points out of 100, so you should spend approximately half of your time answering them. Write legibly! Part 2: Multiple choice. Questions are to be answered on the scantron sheet. There is only one correct answer for each question. On the scantron please write and bubble in your name and UM ID number. These questions are worth 50 points out of 100, so you should spend approximately half of your time answering them.
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Biology 225: Animal Phys Name: __________________________ Exam 2 Student ID:_______________________ Page 2 of 9 Part 1: Short answer. Write answers to short answer/essay questions in the space provided. The exam will be separated for grading, and if your name and ID is not on a page you will not receive credit for that page! Q1. Ion channels at the tips of the hair cells in the cochlea open in response to movement in one direction. The membrane of the hair cells becomes depolarized by K+ movement rather than Na+ movement. Which way does the K+ move and can you predict a reason for this? Hint: The extracellular ±uid around a hair cell is not like the extracellular ±uid elsewhere in the body! 3 points Q2. A person is receiving very large doses of cortisol to suppress her immune system. a. What happens to her secretion of cortisol in response to taking exogenous cortisol? Explain your answer naming specific hormones that may apply. 3 points b. Explain how cortisol treatment may exacerbate symptoms of Diabetes mellitus 2 points - - Q3. If you were a scientist trying to develop a male contraceptive acting on the anterior pituitary, would you try to block the secretion of FSH or LH? Explain the reason for your choice. 4 points - - -
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Biology 225: Animal Phys Name: __________________________ Exam 2 Student ID:_______________________ Page 3 of 9 Q4. Many taste receptors work by inactivating resting K+ leak channels. Explain why this would lead to depolarization of the cell. 3 points Q5. A drug has been designed that specifically blocks the voltage-gated K+ channel of a typical neuron and prevents it from opening. After administration of this drug, explain what changes you would expect in the action potential? In the undershoot? 4 points Q6. A drug that blocks progesterone receptors is taken along with small amounts of prostaglandins to terminate pregnancy within the first two months. Explain how this drug and prostaglandins would cause termination of pregnancy. 4 points
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This note was uploaded on 07/11/2011 for the course BIOLOGY 225 taught by Professor Pavgi during the Spring '10 term at University of Michigan.

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Exam 2 Winter 200 - Biology 225 Animal Phys Name Exam 2 Student ID Exam Instructions This exam has 2 parts Put your name and UM ID number on every

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