The effects of hormones and neutransmitters as they relate to mania and depression are extremely complex and far beyond the scope of a SharePost, but here's a capsule look at the subject.

Glands and organs in the human body produce hormones that are carried through the bloodstream and affect other bodily tissues. Perhaps the best known hormone is insulin, produced by the pancreas, which is a gland.

Nerve cells, or neurons, produce neurotransmitters, chemicals which move like lightning...