PE - the motor unit

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7 Terms

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Motor unit

A motor neurone plus all the muscle fibres it initiates 

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Neuron

A type of nerve cell

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Axon

Carries the action potential from the cell body to the neuromuscular junction

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Synapse

The space between the neuromuscular junction and the skeletal muscle

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Motor end plate

Area of muscle fibre which establishes synaptic contact with motor neurone

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How to create a contraction?

Impulse sent by cell body

AP sent down the axon

AP reaches motor end plate

Acetylcholine created

Acetylcholine travels across synaptic cleft 

Muscle fibres contract

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All or none law

Nerve impulses and other biological processes either occur fully or not at all.