18. The Heart
Cardiac Action Potentials
18. The Heart
Cardiac Action Potentials
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- Multiple Choice
Which of the following correctly identifies a difference between action potentials in cardiac and skeletal muscle?
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Calcium ion channels open in response to changes in membrane potential. What type of opening mechanism do calcium ion channels in cardiac muscle exhibit?
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Autorhythmicity is a unique feature of cardiac pacemaker cells. What feature of cardiac pacemaker cells allows them to be autorhythmic while other cardiac cells are not?
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Cardiac contractile tissue uses sodium, calcium, and potassium channels for depolarization and repolarization. During which phase of the action potential is the calcium channel open?
462views4rank - Textbook QuestionMultiple Choice More than one choice may apply. Which of the following depolarizes next after the AV node? a. b. c. d. e.308views1rank
- Textbook QuestionThe cardiac skeleton of the heart has which two of the following functions? (a) It physically isolates the muscle fibers of the atria from those of the ventricles. (b) It maintains the normal shape of the heart. (c) It helps distribute the forces of cardiac contraction. (d) It allows more rapid contraction of the ventricles. (e) It strengthens and helps prevent overexpansion of the heart.275views
- Textbook QuestionIn the heart, which of the following apply? (1) Action potentials are conducted from cell to cell across the myocardium via gap junctions, (2) the SA node sets the pace for the heart as a whole, (3) spontaneous depolarization of cardiac cells can occur in the absence of nerve stimulation, (4) cardiac muscle can continue to contract for long periods in the absence of oxygen. a. all of the above, b. 1, 3, 4, c. 1, 2, 3, d. 2, 3.566views
- Textbook QuestionWhat is the cardiac cycle? What phases and events are necessary to complete a cardiac cycle?275views