Question

Taste molecules are unique because different molecules trigger _______ in the nose and mouth

Answer 1

Taste molecules trigger specific taste receptors in the nose and mouth, leading to different sensations. Salty tastants directly excite taste neurons, while sour tastants increase hydrogen ion concentrations. Sweet, bitter, and umami tastants require G-protein coupled receptors.

Step-by-step explanation:

In humans, taste molecules are unique because different molecules trigger specific taste receptors in the nose and mouth. Salty tastants contain sodium ions (Na+) that directly excite taste neurons. Sour tastants, which are acids, increase hydrogen ion (H+) concentrations in taste neurons, leading to depolarization. Sweet, bitter, and umami tastants require G-protein coupled receptors.