Why does the sight of or thought of delicious food make our mouths "water"?
Salivary glands secrete saliva
Seeing, smelling or even thinking about tasty food sends signals from the brain that stimulate the salivary glands. This is a reflex action.
The salivary glands respond by secreting saliva into the mouth, which is felt as the mouth "watering". Taste buds do not move, and stomach acid is not what fills the mouth.
Saliva does contain the enzyme salivary amylase, but the mouth "watering" itself is the secretion of saliva by the salivary glands, so releasing digestive enzymes is not the best description.
Hence, the answer is Salivary glands secrete saliva.
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