Final answer:
Acetylcholine is the chemical transmitter that transmits electrical impulses from the nerve to the muscle at the neuromuscular junction, initiating a muscle contraction.
Step-by-step explanation:
The chemical transmitter designed to transmit electrical impulses from the nerve terminal to the skeletal muscle at the neuromuscular junctions is Acetylcholine. This neurotransmitter is released by motor neurons at the neuromuscular junction, and it binds to receptors on the muscle fiber's sarcolemma.
The binding of Acetylcholine results in the opening of ligand-gated ion channels, leading to depolarization of the sarcolemma and initiating a muscle contraction.