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16 terms

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