The Motor Unit and Skeletal Muscle Contraction

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A ......... .......... can only contract when stimulated by an electrical impulse sent from the central nervous system
Skeletal Muscle
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........ ......... are specialised cells which transmit nerve impulses rapidly to a group of muscle fibres
Motor Neurons
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The ..... ...... is a motor neuron and the muscle fibres stimulated by its axon
Motor Unit
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The ...... ...... functions to carry nerve impulses from the brain and spinal cord to the muscle fibres, initiating muscular contraction
Motor Unit
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Sending the nerve impulse to the muscle fibres is an electrochemical process which relies on a nerve ...... ......... to conduct the nerve impulse as a wave of electrical charge down the axon to the motor end plates
Action Potential
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The point where the axon's motor end plates meet the muscle fibre is called the .............. ..........
Neuromuscular Junction
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There is a small gap between the motor end plated and muscle fibre called the .......... ........
Synaptic Cleft
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An action potential cannot cross the synaptic cleft without a .................
Neurotransmitter
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Neurotransmitter called ............. is secreted into the synaptic cleft to conduct the nerve impulse across the gap
Acetylcholine
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If the electrical charge is above a ............ the muscle fibre will contract
Threshold
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Depending on whether the stimulus is above a threshold, all muscle fibres will give a complete contraction or no contraction at all
All-or-none Law
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Other cards in this set

Card 2

Front

........ ......... are specialised cells which transmit nerve impulses rapidly to a group of muscle fibres

Back

Motor Neurons

Card 3

Front

The ..... ...... is a motor neuron and the muscle fibres stimulated by its axon

Back

Preview of the front of card 3

Card 4

Front

The ...... ...... functions to carry nerve impulses from the brain and spinal cord to the muscle fibres, initiating muscular contraction

Back

Preview of the front of card 4

Card 5

Front

Sending the nerve impulse to the muscle fibres is an electrochemical process which relies on a nerve ...... ......... to conduct the nerve impulse as a wave of electrical charge down the axon to the motor end plates

Back

Preview of the front of card 5
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