The function of HTR7 (5-hydroxytryptamine receptor 7, Ensembl gene identifier ENSG00000148680) is as follows. G protein-coupled receptor for 5-hydroxytryptamine (serotonin), a biogenic hormone that functions as a neurotransmitter, a hormone and a mitogen (PubMed:35714614, PubMed:8226867). Ligand binding causes a conformation change that triggers signaling via guanine nucleotide-binding proteins (G proteins) and modulates the activity of downstream effectors (PubMed:35714614, PubMed:8226867). HTR7 is coupled to G(s) G alpha proteins and mediates activation of adenylate cyclase activity (PubMed:35714614). {ECO:0000269|PubMed:35714614, ECO:0000269|PubMed:8226867}.