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| 1 . |
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Refer to Activity 2: Investigating the Refractory Period of Cardiac Muscle. What are extrasystoles?
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| 2 . |
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Refer to Activity 2: Investigating the Refractory Period of Cardiac Muscle. During which portion of the cardiac cycle was it possible to induce an extrasystole?
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| 3 . |
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Was it possible to tetanize the heart by administering multiple electrical shocks to the muscle at the rate of 20 stimuli/sec.?
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| 4 . |
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Why is it important that the heart muscle cannot be tetanized? [Hint]
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| 5 . |
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Refer to Activity 3: Examining the Effect of Vagus Nerve Stimulation. What is the initial effect of vagal stimulation on the heart rate?
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| 6 . |
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Refer to Activity 4: Assessing the Effect of Temperature. What change occurred with the cold (5(C) Ringer's solution?
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| 7 . |
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What change occurred with the warm (32(C) Ringer's solution?
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| 8 . |
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What can be said about the relationship between heart rate and temperature? Choose all that apply:
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| 9 . |
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Refer to Activity 5: Assessing the Effect of Pilocarpine. What happened when the heart was bathed in the pilocarpine solution?
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| 10 . |
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Refer to Activity 6: Assessing the Effect of Atropine.
What was the effect of atropine on the heart?
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| 11 . |
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Atropine is ____________ to pilocarpine, whereas atropine and pilocarpine are both ____________ in their effects on heart activity.
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| 12 . |
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Refer to Activity 7: Assessing the Effect of Epinephrine. What was the effect of epinephrine on heart rate?
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| 13 . |
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What do the effects of epinephrine mimic?
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| 14 . |
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Refer to Activity 8: Assessing the Effects of Digitalis.
What is the effect of digitalis on the heart?
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| 15 . |
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Refer to Activity 9: Assessing the Effect of Various Ions. How does calcium affect the heart rate?
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| 16 . |
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How does sodium affect the heart rate?
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| 17 . |
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How does potassium affect the heart rate?
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| 18 . |
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Which of the ions, if any produced arrythmia? Choose all that apply:
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| 19 . |
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What are ectopic pacemakers?
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| 20 . |
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The spontaneous depolarization of the heart muscle in the absence of external stimulation is ___________, whereas the spontaneous depolarization-repolarization events that occur in a regular and continuous manner in cardiac muscle is called ___________.
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Some questions in this exercise may have more than one correct answer. And answer choices in this exercise are randomized
and will appear in a different order each time the page is loaded.
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