Parkinson's disease occurs when nerve cells in part of the brain die, resulting in less secretion of a neurotransmitter called dopamine.
Dopamine is involved in the control of muscle movement and in emotional responses. As a result, common symptoms of Parkinson's disease are muscle twitching and stiff muscles. Other symptoms can include depression, memory loss and problems with sleeping.
The disease is progressive, so over time the symptoms become worse.

Q: What topic does this question test?

This question tests Control and coordination in A-Level Biology (syllabus code 9700). It is worth 12 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Biology Feb/Mar 2020 examination, Paper 5 Variant 2 (9700_m20_qp_52.pdf).

Question

Parkinson's disease occurs when nerve cells in part of the brain die, resulting in less secretion of a neurotransmitter called dopamine.
Dopamine is involved in the control of muscle movement and in emotional responses. As a result, common symptoms of Parkinson's disease are muscle twitching and stiff muscles. Other symptoms can include depression, memory loss and problems with sleeping.
The disease is progressive, so over time the symptoms become worse.

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