Skeletal Muscle Activity

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A motor nuron and all of the skeletal muscle cells it stimulates is called a ______?

Motor unit

The axon of each motor neuron has numerous endings called______?

Axon terminals

The actual gap between an axonal ending and the muscle cell is called a ______?

Synaptic cleft

Within the axonal endings are many small vesicles containing a neurotransmitter substance called _____?

Acetylcholine

When the _____ reaches the ends of the axon, the neurotransmitter is released, and it diffuses to the muscle cell muscle cell membrane to combine with receptors there

Nerve impulse

Prime mover

The muscle that has the major responsibility for causing a particular movement

Antagonist

Muscles that oppose or reverse a movement

Synergist

Help prime movers by producing the same movement or by reducing undesirable movements

Fixators

Are specialized synergist

Epimysium

1 outside muscle

Perimysium

2 surrounds fascicle

Fascicle

3 bundle of muscle cells

Endomysium

4 Around muscle cell

Thick filament

Middle part, that has myosin

Thin filaments

Attached to the z discs, that has actin filaments

Myofibril

5 filamentous organelle

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