Final answer:
Each mature muscle cell connects to multiple neuromuscular junctions (NMJs).
Step-by-step explanation:
Each mature muscle cell, also known as a muscle fiber, connects to multiple neuromuscular junctions (NMJs). The NMJ is a specialized structure where the axon terminal of a motor neuron synapses with the muscle fiber's sarcolemma. The number of neuromuscular junctions a muscle fiber connects to depends on factors such as the precision and force required by the muscle. For example, muscles that require powerful contractions, like the quadriceps, have many muscle fibers controlled by a single motor neuron, resulting in multiple NMJs connecting to each muscle fiber.