As the 2nd largest system of the body, the endocannabinoid system is actually not an isolated structural system like the nervous system or cardiovascular system. The ECS is a set of receptors distributed throughout the body that are collectively called endocannabinoids. There are two verified receptors CB1 and CB2. PPAR and TRP channels also mediate some functions. Likewise, there are two well-documented endocannabinoids: anadamide and 2-arachidonoyl glycerol (or 2-AG).