Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
What makes up a motor unit?
the neuromuscular junction of a muscle fibre
a muscle fibre and the proteins that allow it to contract
a motor neurone and all the muscle fibres it stimulates
a group of muscle fibres that contract together
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What is the role of acetylcholinesterase at the neuromuscular junction?
to stimulate muscle contraction
to carry signals from the neurone to the muscle
to cause the release of calcium ions
to breakdown acetylcholine
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What stimulates a small muscle force?
stimulation of few motor units
weak signals
stimulation of many motor units
high acetylcholine
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Where are choline and ethanoic acid recycled to reform acetylcholine?
in the sarcoplasm
in the synaptic cleft
in the synaptic knob
in the sarcoplasmic reticulum
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Why must acetylcholine be broken down at the neuromuscular junction?
to allow relaxation between contractions
to stimulate maximum contractions
to prevent overstimulation
to activate more motor units
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Where are acetylcholine vesicles located before release?
sarcolemma
synaptic cleft
synaptic knob
sarcoplasmic reticulum
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What causes acetylcholine to be released from vesicles at the neuromuscular junction?
sodium ion influx
acetylcholinesterase
depolarisation of the muscle fibre
calcium ion influx
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What is the specific chemical transmitted between motor neurones and muscle fibres?
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What organelle provides energy for acetylcholine recycling?
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Describe the events that lead to muscle fibre contraction when an action potential reaches the neuromuscular junction.
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