Action potentials arriving at a presynaptic terminal causeMultiple Choicebreakdown of acetylcholine.calcium ion channels to close.release of neurotransmitter.calcium ion channels to open.

An action potential arriving at the presynaptic terminal causesMultiple Choicevoltage-gated sodium ion channels to open, and sodium ions to diffuse out of the cell.voltage-gated calcium ion channels to open, and calcium ions to diffuse into the cell.voltage-gated sodium ion channels to open, and sodium ions to diffuse into the cell.ligand-gated sodium channels to open, and sodium ions to diffuse out of the cell.acetylcholine to diffuse into the cell.

As a result of calcium ions diffusing into the presynaptic cell,Multiple Choiceacetylcholine is actively transported to the postsynaptic neuron.synaptic vessels migrate to the plasma membrane and release acetylcholine.sodium ions diffuse into the cell.acetylcholine is actively transported from the presynaptic neuron.ligand-gated sodium channels open.

Increased calcium ion permeability of the presynaptic terminal cell membrane is caused by an ______________.Multiple Choiceacetylcholinesodium ionsaction potentialincreased concentration of calcium ions

Each presynaptic terminal contains _________blank, which contain the neurotransmitter _________blank that, when released, cause ligand-gated Na+ channels to open in the motor end-plate. This causes _________blank in the muscle cell.Multiple Choicesynaptic vesicles; acetylcholine; depolarizationproteins; acetylcholine; repolarizationmitochondria; acetylcholinesterase; depolarizationACh receptors; acetylcholinesterase; repolarization

In the sequence of events in neurotransmission, which event occurs just after the action potential arrives at the presynaptic terminal?Group of answer choicesPackaging of the neurotransmitterDelivery of the neurotransmitter to the presynaptic terminalFusion of the synaptic vesicles with the presynaptic membraneInflux of Ca2+ into the presynaptic terminalRelease of the neurotransmitter