A nursing student asks the nurse to differentiate the pathology of Alzheimer disease from that of Parkinson disease. Which description is correct?

Parkinson disease is characterized by an imbalance of dopamine and acetylcholine.

Parkinson disease involves increased dopamine production and decreased acetylcholine.

Alzheimer disease is caused by decreased amounts of dopamine and degeneration of cholinergic neurons.

Alzheimer disease involves a possible excess of acetylcholine and neuritic plaques.