AP PSYCHOLOGY

Detailed explanation-1: -The chemical stimuli of special significance to taste are sugars (sweet), amino acids (umami), sodium chloride and other salts (salty), alkaloids (bitter) and acids (sour). Sugars and amino acids tend to be preferred, while alkaloids and acids tend to be avoided.

Detailed explanation-2: -Sweet, sour, salty, bitter and savory tastes can actually be sensed by all parts of the tongue.

Detailed explanation-3: -Different receptors are triggered by different chemical compounds (or molecules) present in the food. The sour taste receptors are triggered by acids, or more specifically hydrogen ions (H+), and therefore are the tongue’s acid detectors.