Final answer:
Signal transmission across a neuromuscular (myoneural) junction allows the nervous system to move the muscles of a football player.
Step-by-step explanation:
Signal transmission across a neuromuscular (myoneural) junction allows the nervous system to move the muscles of a football player. Motor neuron axons connect to muscle fibers at a neuromuscular junction, which is a specialized synaptic structure. At the neuromuscular junction, the axon terminals release acetylcholine, which binds to receptors on the muscle fiber sarcolemma. This binding opens ligand-gated ion channels, allowing the movement of ions and resulting in depolarization of the sarcolemma, which initiates muscle contraction.