What is Cannabinoid receptors?

In 1988 the first cannabinoid receptors were discovered in lab testing. CBD101: The CBD Beginner’s Guide is a great start to learning about CBD's in and outs. Medical field is starting to recognize CBD's The US National Library of Medicine National Institutes of Health talks about this in there publication.

Abstract
The endocannabinoid system consists of the endogenous cannabinoids (endocannabinoids), cannabinoid receptors and the enzymes that synthesise and degrade endocannabinoids. Many of the effects of cannabinoids and endocannabinoids are mediated by two G protein-coupled receptors (GPCRs), CB(1) and CB(2), although additional receptors may be involved. CB(1) receptors are present in very high levels in several brain regions and in lower amounts in a more widespread fashion. These receptors mediate many of the psychoactive effects of cannabinoids. CB(2) receptors have a more restricted distribution, being found in a number of immune cells and in a few neurones. Both CB(1) and CB(2) couple primarily to inhibitory G proteins and are subject to the same pharmacological influences as other GPCRs. Thus, partial agonism, functional selectivity and inverse agonism all play important roles in determining the cellular response to specific cannabinoid receptor ligands.

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