Identify the relation and fill in the blank.

Decreased production of dopamine: -----------

Parkinson's disease.

Dopamine is a neurotransmitter, a chemical that facilitates transmission of signals between brain cells, or neurons, by binding to neuron receptors. The chemical is involved in controlling emotions, pleasure, movement and incoming information. Dopamine is considered as one of the feel-good neurotransmitters.

Parkinson's disease is a degenerative disease that is associated with a breakdown of dopamine-releasing neurons. Dopamine is involved in everything from cognition and mood to the ability to regulate body movements. If the amount of dopamine in the cells is too low, it can affect muscle control. The lack of dopamine can cause slow movement and muscular paralysis.