Parkinson's disease is characterized by:
Correct answer: D. Dopamine
- A. Nicotine
- B. Acetylcholine
- C. Serotonin
- D. Dopamine
Explanation
Parkinson's disease is characterized by a loss of dopamine-producing neurons in the brain's substantia nigra. Dopamine is essential for coordinating smooth muscle movements and regulating mood. Its deficiency leads to tremors, stiffness, and impaired motor control, hallmark symptoms of Parkinson's. Treatment often involves medications that increase dopamine levels in the brain to alleviate these symptoms.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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