The receptors for ________ tastes detect the presence of hydrogen ions.
A) sour
B) umami
C) salty
D) sweet
E) bitter
Question 2
Imaging studies indicate that the ________ plays a key role in the perceived intensity of pain, while the activity of the ________ is related to the unpleasantness of pain.
A) periaqueductal gray matter; reticular formation
B) somatosensory cortex; anterior cingulate cortex
C) anterior cingulate cortex; secondary somatosensory cortex
D) lateral hypothalamus; medial amygdala
E) reticular formation; periaqueductal gray matter