Name 1. Whi7 17. Which best explains the automaticity of the heart? A T A. The p
ID: 3519334 • Letter: N
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Name 1. Whi7 17. Which best explains the automaticity of the heart? A T A. The pacemaker produces action potentials B. The pacemaker has no real resting membrane potential C. The pacemaker has no voltage gated potassium channels D. The pacemaker has no voltage gated sodium channels 18. Which represents ventricular repolarization in the electrocardiogram? A. P wave. B. QRS wave. C. T wave. D. None of the above. 19. Which is a difference between the ventricular and skeletal action potentials? ntial can't be A. Ventricular action potentials have a period when another action pote produced B. Ventricular action potentials have a plateau phase. C. Ventricular action potentials are longer in duration D. Ventricular action potentials involve voltage gated Ca" channels. E. All of the above. 20. Which is involved in the second heart sound? B. Closing of the semilunar valves. Closing of the atrioventricular valves. 21. Which ions contribute to the plateau phase of the ventricular action potential? A Na and K'. B. Na and Ca. C. Na' and Cr. D. K' and Ca". E. K' and Cr. 22 Which feature muscle tissue is unique to cardiac cells? A Mononucleated. B. Striated. Involuntary. D. Branched. E. None of the above. 23. Which describes the amount of blood remaining in the heart after ventricular A. contraction? B. End diastolic volume. C. End systolic volume. A. Stroke volume. 24. Which is a positive chronotropic agent? A. Parasympathetic stimulation. B. Epinephrine. C. Acetylcholine. D. Hyperkalemia.Explanation / Answer
17. automaticity of heart- pacemaker produces action potentials. (option A)
18. ventricular repolarization- T-wave (option C)
19. difference between ventricular and skeletal action potential- all the given statements (option E)
20. second heart sound- closing of semilunar valves (option B)
21. plateau phase of the ventricular action potential is contributed by potassium and calcium ions (Option D)
22. unique feature of cardiac cells- involuntary (option C)
23. amount of blood remaining in the heart after ventricular contraction- end systolic volume (option C)
24. positive chronotropic agent- epinephrine (option B)
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