Sense of Touch: -
i) Skin is sense organ of touch.
ii) There are encapsulated nerve endings in the skin, which respond to
pressure, heat and cold.
iii) Spots in skin that respond to cold do not respond to heat and vice versa.
iv) Some receptors are present deeper and they are not stimulated until the
tissues above are not compressed firmly.
Sense of Taste: -
i) Tongue is the sense organ of taste.
ii) Tiny organs called taste buds are present on tongue surface. They are
spherical in shape and microscopic in size.
iii) A taste bud consists of a group of cells that are supplied with nerve
endings.
iv) There are four kinds of taste buds i.e. sweet, salty, sour and bitter.
Sense of Smell: -
i) Nose is the sense organ of smell.
ii) Sensitive cells are present in nasal cavity.
iii) Incoming air carry smell particles arouse the sensitive cells.
iv) The olfactory nerve carries the sensation to the brain which determines
the nature of substance.