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 group of muscle fibres that contract together
a motor neurone and all the muscle fibres it stimulates
a muscle fibre and the proteins that allow it to contract
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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 breakdown acetylcholine
to cause the release of calcium ions
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What stimulates a small muscle force?
stimulation of few motor units
high acetylcholine
stimulation of many motor units
weak signals
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Where are choline and ethanoic acid recycled to reform acetylcholine?
in the synaptic knob
in the synaptic cleft
in the sarcoplasmic reticulum
in the sarcoplasm
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Why must acetylcholine be broken down at the neuromuscular junction?
to activate more motor units
to prevent overstimulation
to allow relaxation between contractions
to stimulate maximum contractions
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Where are acetylcholine vesicles located before release?
synaptic knob
sarcolemma
synaptic cleft
sarcoplasmic reticulum
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What causes acetylcholine to be released from vesicles at the neuromuscular junction?
sodium ion influx
depolarisation of the muscle fibre
acetylcholinesterase
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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