hen an action potential arrives at the nerve terminal of a neuromuscular junction, which of the following statements best describes the events that occur?

Depolarisation of the nerve terminal causes the release of ACh which activates nicotinic receptors on the skeletal muscle membrane to cause Ca²⁺ entry and muscle contraction.

Depolarisation of the nerve terminal opens voltage-gated Ca²⁺ channels, Ca²⁺ entry brings vesicles containing ACh to the membrane which form fusion pores causing the release of ACh which activates voltage-gated Na⁺ channels at the end-plate.

Depolarisation of the nerve terminal opens voltage-gated Ca²⁺ channels, Ca²⁺ entry brings vesicles containing ACh to the membrane which form fusion pores causing the release of ACh which binds to muscarinic receptors at the end plate.

Depolarisation of the nerve terminal opens voltage-gated Ca²⁺ channels, Ca²⁺ entry brings vesicles containing ACh to the membrane which form fusion pores causing the release of ACh which binds to ligand gated cation channels at the end-plate.