To which of these tastants are receptor cells not tuned?

Name: To which of these tastants are receptor cells not tuned?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Receptor cells are specifically tuned to detect sweet, bitter, and umami tastes through specialized receptors that bind to molecules associated with these tastes. Salt taste, however, is detected through ion channels that allow sodium ions to enter the cell, rather than through binding to a specific receptor tuned to the taste of salt.

To Which of These Tastants Are Receptor Cells Not Tuned