NPB101Sum08MT2NoKey

NPB101Sum08MT2NoKey - ID: A NPB101MT2Sum08 Multiple...

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ID: A 1 NPB101MT2Sum08 Multiple Choice/True-False Identify the choice that best completes the statement or answers the question. ____ 1. During the upstroke of the Purkinje fiber cardiac action potential Statement #1: Inward current flow is carried by both Na and Ca ions. Statement #2: there are more open K channels than during Phase 4, the resting membrane potenital. Statement #3: there is greater inward than outward current flow. a. All three Statements are true. d. Only Statements #1 and #3 are true. b. All three Statements are false. e. Only Statements #2 and #3 are true. c. Only Statement #1 is true. ____ 2. Which of the following conditions will increase the total contractile energy developed by heart and increase stroke volume? Statement #1: Increasing cardiac contractility only. Statement #2: Increasing venous capacitance. Statement #3: Increasing both contractility and end diastolic volume. a. All three Statements are true. d. Only Statements #1 and #3 are true. b. All three Statements are false. e. Only Statement #3 is true. c. Only Statement #1 is true. ____ 3. The low action potential amplitude, the slow rate of rise of the action potential and the weak electrical coupling between cells in the AV node all contribute to the slow conduction through the AV node. a. True b. False ____ 4. A segment of cardiac tissue is in its relative refractory period. You can conclude that activation will spread through this tissue with the same conduction velocity as when the tissue is fully recovered. a. True b. False
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ID: A 2 ____ 5. This question refers to the cardiac cycle. Statement #1: Depolarization of the atrial muscle must occur before atrial muscle contraction. Statement #2: The onset of passive or rapid filling of the ventricles occurs before the P wave of the electrocardiogram. Statement #3: Most of ventricular filling occurs with atrial contraction. a. All three Statements are true. d. Only Statements #1 and #2 are true. b. Al three Statements are false. e. Only Statement #1 is true. c. Only Statements #1 and #3 are true. ____ 6. Which of the following interventions will increase the slope of the pacemaker potential in the SA nodal pacemaker cell? Statement #1: Increasing sympathetic activity to the SA nodal pacemaker cell. Statement #2: Decreasing sympathetic activity to the SA nodal pacemaker cell. Statement #3: Increasing parasympathetic (vagal) activity to the SA nodal pacemaker cell. Statement #4: Decreasing parasympathetic (vagal) activity to the SA nodal pacemaker cell. a. Only Statement #1 of the four Statements. d. Only Statement #4 of the four Statements. . b. Only Statement #3 of the four Statements. . e. Statements #1 and #4. c. Statements #2 and #3. ____
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This note was uploaded on 01/30/2012 for the course BIS 101/102 taught by Professor Etzler during the Spring '10 term at UC Davis.

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NPB101Sum08MT2NoKey - ID: A NPB101MT2Sum08 Multiple...

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