The ECS maintains stable communication with all the organ systems of the human body. This communication includes messenger molecules called endocannabinoids that act on cannabinoid receptors in every cell that accepts them. It acts as a "key and lock" system.
Receptors act like locks, and endocannabinoids are keys that bind to these receptors and release them. The cannabis plant consists of more than one hundred cannabinoids.
These compounds closely resemble human endocannabinoids. Therefore, one can use CBD oil to relieve pain. The main cannabinoid in hemp is CBD, and in marijuana it is THC. Unlike THC, CBD does not openly bind to our cannabinoid receptors.