When we perceive the aroma of a delicious food, our mouth becomes watery. Explain.

Explanation

It is a reflex action.
The stimulus: Aroma of the food is the stimuli.
Recepor: Nose is the receptor. Sensory neurons: These neurons in the nose transmit the impulse to the spinal cord. The spinal cord: Relay neurons (present in the brain and the spinal cord) connect the sensory neurons and the motor neurons in the spinal cord. Motor neurons: These neurons send nerve impulses away from the central nervous system to the effector. Here the effectors are salivary glands. Salivary glands secrete saliva and our mouth becomes watery.