Answer: Parkinson disease.
- A Alzheimer disease
- B Parkinson disease
- C Multiple sclerosis
- D Myasthenia gravis
Correct answer: B. Parkinson disease
Explanation: Parkinson disease: degeneration of dopamine-producing neurons in substantia nigra. Causes tremors, rigidity, and impaired movement.
Structure of a neuron. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Brain, spinal cord, neurons, reflex arcs, and sense organs.