The 5-HT2A receptor is a subtype of the 5-HT₂ receptor that belongs to the serotonin receptor family and functions as a G protein-coupled receptor. It is a cell surface receptor that activates multiple intracellular signalling cascades.
Like all 5-HT₂ receptors, the 5-HT2A receptor is coupled to the Gq/G₁₁ signaling pathway. It is the primary excitatory receptor subtype among the serotonin-responsive GPCRs. From Wikipedia
