calcium chloride (CaCl 2), a granular white chemical with an unpleasant taste. It is used in a concentrated solution of the chloride salt of calcium to replenish calcium in the blood and also has uses in cardiac resuscitation.
Neuropeptides are small protein-like molecules (peptides) used by neurons to communicate with each other. They are neuronal signaling molecules that influence the activity of the brain in specific ways.
Protein-based hormones, more commonly called peptide hormones, are made up of amino acids, which are the structural building blocks of all proteins, including the proteins you eat. Peptide hormones tend to be globular, meaning that they have a ball-like shape.