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When a long threadlike extension of the neuron, called the nerve fiber or exon, reaches the muscle, it branches into a number of axonal terminals, each of which forms junctions with the sarcolemma of a different muscle cell (figure 6.5)
The gap between the endings of the muscle cells' membrane.
Filled with tissue (interstitial) fluid
Acetylcholine or ACh
The specific neurotransmitter that stimulates the muscle cell.
Defuses across the synaptic cleft and attaches to receptors (membrane proteins), which are part of the sarcolemma.
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