MEDICAL PHYSIOLOGY

Detailed explanation-1: -After the neuron has fired, there is a refractory period in which another action potential is not possible. The refractory period generally lasts one millisecond. During this time, the potassium channels reopen and the sodium channels close, gradually returning the neuron to its resting potential.

Detailed explanation-2: -Resting Membrane Potential A neuron is at rest when it is not sending an an electrical signal. During this time, the inside of the neuron is negative relative to the outside.

Detailed explanation-3: -When the neuron “fires, ‘’ this charge travels down the axon and causes neurotransmitters to be released by the terminal buttons. The fact that an action potential in the axon occurs either full-blown or not at all. The microscopic gap that serves as a communications link between neurons.

Detailed explanation-4: -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.