The diagram below shows a synapse in skeletal muscle of a weightlifter - Scottish Highers Human Biology - Question 10 - 2016
Question 10
The diagram below shows a synapse in skeletal muscle of a weightlifter.
(a) Name the part of the motor neuron labelled P.
_________________
(b) Describe what acet... show full transcript
Worked Solution & Example Answer:The diagram below shows a synapse in skeletal muscle of a weightlifter - Scottish Highers Human Biology - Question 10 - 2016
Step 1
Name the part of the motor neuron labelled P.
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Answer
Axon
Step 2
Describe what acetylcholine does when it reaches the post-synaptic membrane.
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Answer
It attaches to a receptor or diffuses into the receptor on the postsynaptic membrane.
Step 3
Name the type of skeletal muscle fibres which will be the most common in the arm muscles of a champion weightlifter.
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Answer
Fast twitch/Type 2.
Step 4
Explain how an agonist works.
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Answer
Agonists bind to and stimulate receptors (neurotransmitter receptors).
Step 5
Suggest how nicotine induces feelings of pleasure and so reinforces smoking behaviour.
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Answer
Nicotine triggers the release/activates dopamine/endorphins, stimulating the reward pathway.
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