Multiple Choice
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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18. The Heart
Cardiac Action Potentials
Back18. The Heart
Cardiac Action Potentials
- Multiple Choice
Calcium ion channels open in response to changes in membrane potential. What type of opening mechanism do calcium ion channels in cardiac muscle exhibit?
1views - Multiple ChoiceWhich of the following would increase cardiac output to the greatest extent?
- Multiple ChoiceWhich part of the heart's electrical conduction system is responsible for initiating the heartbeat?
- Multiple ChoiceWhat change would lead to an increase in cardiac output during exercise?
- Multiple ChoiceWhich electrolyte is most directly responsible for triggering cardiac muscle contraction by entering the cell and initiating calcium-induced calcium release?
- Multiple ChoiceWhich method should a nurse use to assess a client for a pulse rate deficit?
- Multiple ChoiceWhich feature is characteristic of an action potential at the SA node?1views
- Multiple ChoiceHow do you calculate cardiac output?
- Multiple ChoiceVentricular depolarization is represented by which of the following on an electrocardiogram (ECG)?1views
- Textbook Question
What are the effects of the plateau phase of the contractile cell action potential?
- Multiple Choice
How would you expect the absolute refractory period of a contractile cell to change if more potassium channels opened sooner after polarization?
- Multiple ChoiceWhich two values are required to calculate cardiac output (CO) for a ventricle?
- Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The repolarization phase of the contractile cell is due to the potassium ions rushing into the cell through potassium ion channels.
4views - Multiple Choice
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?
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