when an action potential arrives at the axon terminal of a motor neuron, which ion channels open?

At the axon terminal of a motor neuron, voltage-gated calcium channels open when the action potential arrives. The calcium influx then triggers neurotransmitter release into the synaptic cleft.

Quick Scoop

• Correct ion channels: voltage-gated calcium channels.

• Why they open: the arriving action potential depolarizes the terminal membrane.

• What happens next: calcium entry helps vesicles release acetylcholine at the neuromuscular junction.

If you want, I can also explain the full sequence from action potential arrival to muscle contraction.