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Questions and Answers
During which phase of the action potential do inward positive current stops?
During which phase of the action potential do inward positive current stops?
- Phase 0
- Phase 2
- Phase 3 (correct)
- Phase 1
Which ion is responsible for the small outward positive current during the plateau phase?
Which ion is responsible for the small outward positive current during the plateau phase?
- Na+
- Cl-
- Ca++
- K+ (correct)
What is the role of the Na+-Ca++ exchanger during the late part of the plateau phase?
What is the role of the Na+-Ca++ exchanger during the late part of the plateau phase?
- It increases Na+ influx
- It enhances K+ efflux
- It increases Ca++ influx
- It produces inward positive current (correct)
Which ion channels are responsible for maintaining the membrane potential nearly constant during the plateau phase?
Which ion channels are responsible for maintaining the membrane potential nearly constant during the plateau phase?
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What causes the repolarization in phase 3 of the action potential?
What causes the repolarization in phase 3 of the action potential?
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What is the duration of the plateau phase in ventricular myocytes?
What is the duration of the plateau phase in ventricular myocytes?
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Which ion is carried out by the Na+-Ca++ exchanger during the late part of the plateau phase?
Which ion is carried out by the Na+-Ca++ exchanger during the late part of the plateau phase?
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