Respuesta :
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:
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.
