Physiology General 88a0c6f0 Sour taste is mediated by A Na+ selective channel (ENac) B G - protein coupled receptors C H+ ions permeable to ENaCs D Glutamate receptors High-Yield Explanation Salt ⇒ mediated by Na+ selective channel (ENaC) Sour ⇒ mediated by H+ ions permeable to ENaCs Bitter, sweet, umami ⇒ mediated by G-protein coupled receptors