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Irritability

The ability to receive and respond to a stimulus

Contractility

The ability to shorten (forcibly) when an adequate stimulus is received

Motor Unit

One neuron and all the skeletal muscle cells it stimulates (figure 6.4)

Neuromuscular Junctions

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)

Synaptic Cleft

The gap between the endings of the muscle cells' membrane.
Filled with tissue (interstitial) fluid

Neurotransmitter

A chemical released when the nerve impulse reaches the axonal terminals

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.

Action Potential

The "upset" caused by a rushing intake of sodium ions (Na+) through the muscle cell

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