Question

3 An action potential is usually initiated in an axon at or near

Answer 1

An action potential is usually initiated at or near the axon hillock. The axon hillock is the region of the neuron where the axon begins and is located at the junction between the cell body (soma) and the axon. This area contains a high density of voltage-gated sodium channels, making it critical for the generation of action potentials. When the membrane potential reaches a certain threshold, these channels open, leading to the rapid depolarization characteristic of an action potential.