Phases Of Action Potential
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Plateau Phase (Repolarization) - Slow inward movement of calcium and outward movement of potassium
About This Quiz
Polarization is the property applying to transverse waves that specify the geometrical orientation of the oscillations. Phases of action potential gauge your understanding of the different aspects of polarization. Take up the challenge and all the best.
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- 2.
Rapid Repolarization - the end of sodium and calcium inflow and the rapid outward of potassium
Explanation
Phase 3 of cardiac action potential is characterized by rapid repolarization, which refers to the end of sodium and calcium inflow and the rapid outward movement of potassium ions. During this phase, the potassium channels open, allowing potassium ions to move out of the cell, which leads to the restoration of the cell's resting membrane potential. This repolarization prepares the cell for the next action potential and allows for proper cardiac rhythm and function.Rate this question:
- 3.
Resting membrane potential - large permeable to potassium with the net loss of intracellular potassium
Explanation
In phase 4 of the cardiac action potential, the resting membrane potential is maintained. This is achieved by having a large permeability to potassium ions, which allows for the net loss of intracellular potassium. This loss of positive charge contributes to the negative resting membrane potential.Rate this question:
- 4.
Early Repolarization - The influx of sodium slows and the cell begins to repolarize.
- 5.
Relative Refractory Period - the cell can be excited to produce an action potential but only by a stimulus that is much stronger than normal
- 6.
Rapid Depolarization - sodium(Na) ions flooding into the cell
Explanation
During the rapid depolarization phase (Phase 0) of an action potential, the correct answer states that sodium (Na) ions flood into the cell. This is because during Phase 0, the cell membrane rapidly becomes more positive as sodium channels open and allow sodium ions to rush into the cell. This influx of positive ions causes the membrane potential to rapidly depolarize, leading to the initiation of an action potential.Rate this question:
- 7.
Absolute Refractory Period n-
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Current Version
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Mar 22, 2023Quiz Edited by
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Sep 13, 2013Quiz Created by
Kemcneil
Dr Gawad Physiology Course Online Exam - Excitable - Lec 2 (Action Potential, Compound action potential, All or none rul
Dr Gawad Physiology Course Online Exam - Excitable - Lec 2 (Action Potential, Compound action potential, All or none rul
Dr Gawad Course Online Exam - Excitable - Lec 2 (Action Potential, Compound action potential, All or none rule)
Dr Gawad Course Online Exam - Excitable - Lec 2 (Action Potential, Compound action potential, All or none rule)
basic electrophysiology quiz questions and answers
basic electrophysiology quiz questions and answers
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