Phases Of Action Potential
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Rapid Depolarization - sodium(Na) ions flooding into the cell
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.
Early Repolarization - The influx of sodium slows and the cell begins to repolarize.
- 3.
Plateau Phase (Repolarization) - Slow inward movement of calcium and outward movement of potassium
Explanation
Phase 2 of the cardiac action potential is known as the plateau phase. During this phase, there is a slow inward movement of calcium ions and an outward movement of potassium ions. This balance between calcium and potassium ions helps to maintain the depolarized state of the cell membrane, prolonging the action potential and allowing for sustained contraction of the cardiac muscle. This phase is important for the efficient pumping of blood by the heart.Rate this question:
- 4.
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:
- 5.
Absolute Refractory Period n-
- 6.
Relative Refractory Period - the cell can be excited to produce an action potential but only by a stimulus that is much stronger than normal
- 7.
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:
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Current Version
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Mar 22, 2023Quiz Edited by
ProProfs Editorial Team -
Sep 13, 2013Quiz Created by
Kemcneil
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