NPB 101- Goldberg SP08 Final

NPB 101- Goldberg SP08 Final - Test Form A Multiple Choice...

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Test Form: A 1 101Sp08GoldbergSectofFinal Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. For a Purkinje fiber action potential, Statement #1: during the upstroke, inward current flow is carried by both Na and some Ca ions. Statement #2: during the plateau phase, inward current is carried by Ca ions and outward current flow is carried by K ions. Statement#3: termination of the plateau phase & initiation of terminal repolarization occurs following inactivation of Ca current channels. a. All three Statements are true. d. Only Statement #1 is true. b. All three Statements are false. e. Only Statements #1 and #3 are true. c. Only Statements #2 and #3 are true. ____ 2. Statement #1. If a tissue segment in the heart is effectively refractory you can conclude that all the cells in the segment are absolute refractory. Statement: #2: If a tissue segment in the heart is relatively refractory, spread of activation through the tissue will occur, but conduction velocity through the tissue will be slowed. ____ 3. Statement #1: Sympathetic stimulation of SA nodal pacemaker cells increases the slope of the pacemaker potential (diastolic depolarization) but it has no affect on the maximum diastolic potential.. Statement #2: Parasympathetic stimulation to the SA nodal pacemaker cells increases the maximum diastolic potential but has no affect on the slope of the pacemaker potential (diastolic depolarization)
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Test Form: A 2 ____ 4. The stroke volume ejected by the heart can be increased by only increasing both end diastolic volume (muscle fiber length) and contractility. a. True b. False ____ 5. Compared to the control ecg tracing, which tracing shows the effect of sympathetic stimulation to only the SA node?
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Test Form: A 3 ____ 6. Use the graph below. Statement #1: Curve A represents an increase in contractility from Control. Statement #2: Point 9 represents an increase in muscle fiber length without a change in contractility from Control. a. Both Statements are true. c. Only the first Statement is true. b. Both Statements are false. d. Only the second Statement is true.
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Test Form: A 4 ____
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