During the initiation of muscle contraction, a neural signal triggers the release of the neurotransmitter acetylcholine into the synaptic cleft. The specific receptors for acetylcholine are located on the:

Step-by-step solution

At the neuromuscular junction (motor end plate), the arrival of a neural signal causes the release of the neurotransmitter acetylcholine from the motor neuron into the synaptic cleft. Acetylcholine diffuses across the cleft and binds to its specific receptors, which are located on the sarcolemma (the plasma membrane of the muscle fibre). This binding generates an action potential in the sarcolemma that spreads through the muscle fibre. The sarcoplasmic reticulum is the internal storehouse for calcium ions. Synaptic