Which of the followingcharacteristics determines when the refractory period ends

Question

Which of the followingcharacteristics determines when the refractory period ends?


how long it takes for the voltage-gatedNa+ channels to close at the end of an actionpotential how long it takes for the voltage-gatedK+ channels to close during the undershoot phase how low the membrane potential drops belowresting potential during the undershoot phase how long it takes for the voltage-gatedNa+ channels to reactivate at the end of an actionpotential how long it takes for the membrane potential toreturn to resting potential after the undershoot phase Which of the followingcharacteristics determines when the refractory period ends?


how long it takes for the voltage-gatedNa+ channels to close at the end of an actionpotential how long it takes for the voltage-gatedK+ channels to close during the undershoot phase how low the membrane potential drops belowresting potential during the undershoot phase how long it takes for the voltage-gatedNa+ channels to reactivate at the end of an actionpotential how long it takes for the membrane potential toreturn to resting potential after the undershoot phase

Explanation / Answer

Refractory period:

Opining of voltage gated sodium channels permits influx of sodium ions for about 1 millisecond, which results in sudden large depolarization of a membrane segment (at ­­­-70 to +30 mV). Then voltage gated sodium channels get closed for some time, this period is called the refractory period. During this period, no entry of Na+ ions into the cytosol takes place.

Thus, the correct option is (D) how long it takes for the voltage-gated Na+ channels to reactivate at the end of an action potential.

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