Question

"The occurrence of the all-or-none ________________ results from depolarization in response to rapid entry of ____________ ions into the neuron A. resting potential; sodium B.action potential; sodium C.resting potential; potassium D.action potential; potassium E.hormonal response; potassium F. hormonal response; sodium"

Answer 1

Answer:

The correct answer is

B.action potential; sodium

Explanation:

Action potential

Nerve action potentials are initiated and propagated in an all or nothing fashion. The all-or nothing action potential is initiated when the membrane potential threshold value is reached

Sodium

Voltage-gated Na⁺ ions membrane channels open enabling an influx of sodium ions to rapidly enter the cell, raising the membrane potential up to +40 mV

Depolarization  in the neuron is based ion exchange channels opening to allow the rapid influx of sodium ions (Na⁺) and the efflux of potassium ions (K⁺)

The neuronal responds rapidly and for short periods to the activation of an ion channel receptor by a drug or natural neurotransmitter is rapid rel

Answer 2

Answer:

B. action potential; sodium.

Explanation:

Action potential occurs when the membrane potential of a specific cell location rapidly rises and falls.

These are generated by special types of voltage-gated ion channels embedded in a cell's plasma membrane. They are shut when the membrane potential is near the resting potential of the cell, but they open rapidly if the membrane potential increases to a defined threshold voltage, depolarising the membrane potential, this then allows the inward flow of sodium ions, which changes the electrochemical gradient.