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5 Smell and taste

Smell and taste happen because of interactions between chemoreceptors
and chemical substances.

Smell

Olfactory receptors
generate nerve Olfactory
impulses. They are nerves send
located in the olfactory nerve
olfactory epithelium. impulses to the
brain.

Nasal mucosa
Olfactory has many blood
epithelium is part vessels to
of the mucous warm the air.
membrane.

Taste

The papillae on the roof of the mouth, the pharynx and mainly the tongue
help us to perceive taste. Taste buds are located on the papillae.

DIFFERENT TYPES OF PAPILLAE

Taste buds are receptors that Receptors generate nerve impulses
detect specific tastes. that are sent to the brain to perceive
taste.

Vallate
papillae

Filiform
papillae

Fungiform
papillae

Flavour is the result of our perception of foods. This comes from both taste
and smell. Sweet, sour, salty and bitter are the traditional descriptions of
taste. There are others like savoury (umami), fatty and metallic.

66 UNIT 6