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What is Refractory period of a myelinated nerve is due to: and explain in detail?
Only when the membrane has repolarized up to about - 40 mV to - 50 mV that the Na+ channels recover from their inactivated state and go into resting state. All this while, the membrane is refractory; that is, the membrane can excite again only when many of the Na+ channels have recovered (which itself depends on the membrane potential). Hence, refractory period is due to the voltage-dependance of the Na+ channels.