Skeletal muscle contraction

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what does the skeletal muscles need to contract?
1-Cell body (located in spinal cord) 2-Axons (Branch off the cell body and send impulses to the motor end plates) 3-Motor end plates (where the action potential from an action travels to,to stimulate a muscle)
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what are motor neurons?
where a motor neuron meets the muscle fibres
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What is the CNS made up of?
electrical impulses from the central
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What is a motor unit?
specialised cells that transmit nerve impulses from the CNS in the spinal cord and brain to the muscle fibres
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what is between the motor neuron and muscle fibres?
when the action potential reaches the neuromusclar junction, a neurotransmitter in the form of acetylcholine (Ach) is secreted into the synaptic cleft
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1st stage of the muscle fibres to be stimulated for the muscle to contract?
This depolarises the motor end plate and a muscle contraction threshold is formed
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2nd stage of the muscle fibres to be stimulated for the muscle to contract?
Neuromuscular junction
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3rd stage of the muscle fibres to be stimulated for the muscle to contract?
when a motor neuron becomes depolarised it fires an action potential (an electrical impulse that acts as a signal)
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4th stage of the muscle fibres to be stimulated for the muscle to contract?
1-Slow contraction time 2-High oxidative capacity 3-high resistance to fatigue 4- low force production 5-E.g. long distance runner
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What is the 'all or none law?'
1-High oxidative capacity 2-Fast contraction time 3-suited for lengthy anaerobic exercise 4-high force 5-E.g. basketball
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What is type I (slow-twitch)
The action potential leads to a wave of contraction down the muscle fibres
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What is type IIa (fast oxidative glycoltic?)
A muscle fibre cannot partially contract, it either fully or not at all
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what is type IIx (Fast glycolytic?)
1-Low oxidative capacity 2-Fastest contraction time 3-Suitable for short anaerobic exercise 4-Low resistance to fatigue 5-Highest force production 5-sprinter
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1-Low oxidative capacity 2-Fastest contraction time 3-Suitable for short anaerobic exercise 4-Low resistance to fatigue 5-Highest force production 5-sprinter
1-Low oxidative capacity 2-Fastest contraction time 3-Suitable for short anaerobic exercise 4-Low resistance to fatigue 5-Highest force production 5-sprinter
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1-Low oxidative capacity 2-Fastest contraction time 3-Suitable for short anaerobic exercise 4-Low resistance to fatigue 5-Highest force production 5-sprinter
1-Low oxidative capacity 2-Fastest contraction time 3-Suitable for short anaerobic exercise 4-Low resistance to fatigue 5-Highest force production 5-sprinter
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1-Low oxidative capacity 2-Fastest contraction time 3-Suitable for short anaerobic exercise 4-Low resistance to fatigue 5-Highest force production 5-sprinter
1-Low oxidative capacity 2-Fastest contraction time 3-Suitable for short anaerobic exercise 4-Low resistance to fatigue 5-Highest force production 5-sprinter
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Other cards in this set

Card 2

Front

what are motor neurons?

Back

where a motor neuron meets the muscle fibres

Card 3

Front

What is the CNS made up of?

Back

Preview of the front of card 3

Card 4

Front

What is a motor unit?

Back

Preview of the front of card 4

Card 5

Front

what is between the motor neuron and muscle fibres?

Back

Preview of the front of card 5
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