Our endocannabinoid system (or ECS) produces cannabinoids (endocannabinoid means cannabinoids produced inside the body) within cell membranes. It also receives cannabinoids as neurotransmitters through its receptors, which are located all over the body. The ECS is like a general in charge of the army of systems in your body. It communicates with other body systems such as the immune system and endocrine system and tells them when to turn on and (perhaps even more importantly) when to turn off.