3 Classes of Purinergic Receptors
| Name | Activation | Class |
| P1 receptors | adenosine | G protein-coupled receptors |
| P2Y receptors | nucleotides
|
G protein-coupled receptors |
| P2X receptors | ATP | ligand-gated ion channel |
There are three known distinct classes of purinergic receptors, known as P1, P2X, and P2Y receptors.
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