Summer Quiz 2a - d. Na+ channels being activated, K+...

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Name _____________________ Bio 365R Vertebrate Physiology Quiz # 2 1-2. Name any two of general types of Ion Channels/pumps described in chapter 4. Ex. Voltage-gated ion channels, ligand-gated ion channels 3. In myelinated axons, action potential generation occurs at specific points along the axon called _____________. nodes of Ranvier 4. What can cause an undershoot following an action potential? a. Na+ channels being inactivated, K+ channels being inactivated b. Na+ channels being inactivated, K+ channels being activated c. Na+ channels being activated, K+ channels being inactivated
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Unformatted text preview: d. Na+ channels being activated, K+ channels being activated 5. Which ion is most permeable while the cell is at rest? a. Acetylcholine b. Potassium c. Calcium d. Magnesium e. sodium 6-7. Why is the Na+/K+ pump referred to as ‘electrogenic?’ How many Na+ ions are pumped out and how many K+ ions are pumped in? The number of charges transported in and out of the cell is unequal. 3 Na+ ions out, 2 K+ ions in 9-10. How does myelin increase conduction velocity? It insulates the axon, increasing membrane resistance and allowing for saltatory conduction....
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This note was uploaded on 01/20/2010 for the course BIO 55401 taught by Professor Bittner during the Spring '10 term at University of Texas at Austin.

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