Sour taste is mediated by: (A) Na+ selective channel (ENac), (B) G - protein coupled receptors, (C) H+ ions permeable to ENaCs, (D) Glutamate receptors
Answer is C. Salt ⇒ mediated by Na+ selective channel (ENaC)
Sour ⇒ mediated by H+ ions permeable to ENaCs
Bitter, sweet, umami ⇒ mediated by G-protein coupled receptors