PHYSIOLOGY
SLIDING FILAMENT MODEL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which is the correct order of events in depolarisation then repolarisation?
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Sodium channels close, potassium channels open
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Sodium channels open, potassium channels open,
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Sodium channels open, potassium channels close
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Potassium channels open, sodium channels open
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Explanation:
Detailed explanation-1: -In neurons, the rapid rise in potential, depolarization, is an all-or-nothing event that is initiated by the opening of sodium ion channels within the plasma membrane. The subsequent return to resting potential, repolarization, is mediated by the opening of potassium ion channels.
Detailed explanation-2: -Phase zero is the phase of depolarization. Phases one and two are not present in pacemaker cells. Phase three is repolarization, involving the closing of Ca2+ channels, blocking the flow of Ca2+ ions. Phase four, a phase of gradual depolarization, is unique to the pacemaker cells. 21-Apr-2022
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