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Questions and Answers
What effect would a drug that partially inactivates fast sodium channels have on the action potential in a ventricular myocyte?
What effect would a drug that partially inactivates fast sodium channels have on the action potential in a ventricular myocyte?
- The action potential would not be affected
- The action potential would become more negative
- The action potential would be shortened
- The action potential would be prolonged (correct)
How would a drug that partially inactivates fast sodium channels affect conduction velocity within the ventricle?
How would a drug that partially inactivates fast sodium channels affect conduction velocity within the ventricle?
- Conduction velocity would be increased
- Conduction velocity would become erratic
- Conduction velocity would be slowed (correct)
- Conduction velocity would not be affected
What is the primary function of fast sodium channels in cardiac myocytes?
What is the primary function of fast sodium channels in cardiac myocytes?
- To initiate the depolarization phase of the action potential (correct)
- To facilitate potassium efflux from the cell
- To maintain the resting membrane potential
- To regulate calcium influx into the cell
