What Keeps the HCN Channels Open

Question

What keeps the HCN channels open? A)G-proteins B)cAMP C)ATP D)Ca²⁺

Accepted Answer

HCN channels, also known as hyperpolarization-activated cyclic nucleotide-gated channels, are kept open by cyclic AMP (cAMP). cAMP binds to these channels and stabilizes them in the open configuration, allowing ions to pass through.