dopamine vs. serotonin

dopamine

noun

  1. Biochemistry.,  a catecholamine neurotransmitter in the central nervous system, retina, and sympathetic ganglia, acting within the brain to help regulate movement and emotion: its depletion may cause Parkinson's disease.

  2. Pharmacology.,  a dopamine preparation used to increase the force of contraction of the heart in the treatment of shock.

serotonin

noun

Biochemistry.

  1. a neurotransmitter, derived from tryptophan, that is involved in sleep, depression, memory, and other neurological processes.