Final answer:
The "motor end plate" is the area of the muscle fiber sarcolemma at the neuromuscular junction with receptors for acetylcholine, and the EMG'ers name for it is the Neuromuscular junction.
Step-by-step explanation:
The term "motor end plate" refers to a specific area of the muscle fiber's sarcolemma that interacts with a motor neuron at the neuromuscular junction (NMJ). This plate is where the receptors for the neurotransmitter acetylcholine (ACh) are located. When ACh is released by the motor neuron, it diffuses across the synaptic cleft and binds to these receptors, which initiates a cascade of events leading to muscle contraction. Therefore, the EMG'ers name for the motor end plate is b) Neuromuscular junction.
At the NMJ, the axon terminal of the motor neuron releases ACh into the synaptic cleft. The motor end plate, rich in ACh receptors, receives this signal, and through the process of excitation-contraction coupling, a muscle contraction is initiated. This neuromuscular communication is essential for voluntary muscle movements and reflex actions.