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Unformatted text preview: Print Name: ________________________________ Test From: A 1 NPB101Sum09-MT2 Scantron: 1. Clearly Print your Name 2. Subject: 101Sum09-MT2 3. Test No: MT2 4. Date: 7-20-09 5. Bubble in your UCD ID# and Write each digit at the top of its column 6. Bubble in your Test Form. Turn in your Scantron. You may keep your copy of the examination. Multiple Choice/ True-False Identify the choice the answer that best completes the statement or answers the question. ____ 1. Which of the following Statements is/are correct regarding ion channel activation during the upstroke, Phase 0, of the Purkinje Fiber action potential? Statement #1: Inward current is carried through Ca channels and fast Na channels. Statement #2: There are more K channels activated than during the resting membrane potential. Statement #3: Phase 0 is terminated with inactivation of the fast Na channels and all the Ca channels. a. All three Statements are true. d. Only Statements #1 and #2 are true. b. All three Statements are false. e. Only Statements #1 and 3 are true. c. Only Statement #1 is true. ____ 2. Condition: A cardiac cell membrane potential is not changing over time, ie. the membrane potential is flat. There is an intervention, and you observe an increase in both inward and outward + current flow with outward current flow much greater than the inward current flow. As the consequence of these change in current flow, Statement: you would observe a shift in the membrane potential to a less positve, or negative membrane potential. a. True b. False Test Form: A 2 ____ 3. Which of the following conditions will shorten the time for cell to cell spread of activation in cardiac tissue? Statement #1: Increasing the conductivity of through the connexons in the gap junctions. Statement #2: Stimulating the tissue earlier rather than later in its relative refractory period. Statement #3: Stimulating the tissue later rather than earlier in its relative refractory period. a. Only Statement #1 is true. d. Only Statements #1 and #2 are true. b. Only Statement #2 is true. e. Only Statements #1 and #3 are true. c. Only Statement #3 is true. ____ 4. The funny Na channel Statement #1: is activated during depolarization. Statement #2: is activated during repolarization. Statement #3: generates the inward current flow responsible for the pacemaker potential. a. Only Statement #1 is true. d. Only Statements #1 and #3 are true. b. Only Statement #2 is true. e. Only Statements #2 and #3 are true. c. Only Statement #3 is true. ____ 5. Sympathetic stimulation to the SA nodal pacemaker cells Statement #1: decreases the maximum diastolic potential (shifts the membrane potential closer to threshold.) Statement #2: increases the slope of the pacemaker potential....
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This note was uploaded on 11/07/2010 for the course NPB NPB 101 taught by Professor Weidner/wingfield during the Spring '08 term at UC Davis.
- Spring '08