Question

q4.5. why do neurons generate an action potential, instead of simply relying on the opening of ion channels near the stimulus site to transmit information? because without the action potential, changes in (v_m) at the stimulus site might not reach the axon terminal because without the action potential, the neuron would not depolarize because action potentials help the body keep ion concentrations at appropriate levels because without the action potential, the neuron would not return to resting potential

Explanation:

Neurons generate action potentials to ensure that electrical signals can travel long - distances along the axon to the axon terminal. Changes in membrane potential ($V_m$) at the stimulus site alone may decay before reaching the axon terminal. Action potentials are all - or - none events that propagate without decrement.

Answer:

Because without the action potential, changes in $V_m$ at the stimulus site might not reach the axon terminal