Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
What makes up a motor unit?
a motor neurone and all the muscle fibres it stimulates
a muscle fibre and the proteins that allow it to contract
a group of muscle fibres that contract together
the neuromuscular junction of a muscle fibre
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What is the role of acetylcholinesterase at the neuromuscular junction?
to carry signals from the neurone to the muscle
to stimulate muscle contraction
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 synaptic knob
in the synaptic cleft
in the sarcoplasm
in the sarcoplasmic reticulum
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Why must acetylcholine be broken down at the neuromuscular junction?
to stimulate maximum contractions
to allow relaxation between contractions
to prevent overstimulation
to activate more motor units
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Where are acetylcholine vesicles located before release?
sarcoplasmic reticulum
sarcolemma
synaptic knob
synaptic cleft
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What causes acetylcholine to be released from vesicles at the neuromuscular junction?
depolarisation of the muscle fibre
acetylcholinesterase
sodium ion influx
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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