Question

Action potential is generated by

• A. $N{a}^{+}$
• B. $K^{+}$
• C. $C{a}^{+}$
• D. $C{l}^{-}$

Answer 1

The correct option is A $N{a}^{+}$

Action potential is a short-lasting event in which the electrical membrane potential of a cell rapidly rises and falls.
When the action potential travels down the axon, there is a change in the polarity across the membrane. The Na${}^{+}$ and K${}^{+}$ gated ion channels open and close as the membrane reaches the threshold potential, in response to a signal from another neuron. At the beginning of the action potential, the Na${}^{+}$ channels open and Na${}^{+}$ moves into the axon, causing depolarization. Repolarization occurs when the K${}^{+}$ channels open and K${}^{+}$ moves out of the axon.
So, the correct answer is option A.