When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what the following are examples of :
(a) the smell of the food
(b) the cells in your nasal passage which perceive the smell
(c) the gland which stimulated to secrete saliva.
(a) Unconditioned Stimulus (it is any stimulus evoking an unlearnt response).
(b) Olfactory receptors (it is the cells in your nasal passages which perceive the smell).
(c) Salivary gland is the gland which is stimulated to secrete saliva.