Enkephalins
Endorphins that bind to specific receptor sites, opiate receptors
Substance p
Functions as a neurotransmitter in then transmission of pain impulses
Nitric oxide
Acts as a vasodilator
Agonist
Substance that initiates a physical response when combined with a receptor! Example is muscle contraction
Glutamate
Neurotransmitter
Gaba
Neurotransmitter that slows down nerve cells
Serotonin
Constricts blood cells and is a neurotransmitter. Deficiency leads to depression
Fun orphans
Used for pain relief in heroin treatment
Cholecystokinin
Feeling of fullness after eating