The Sense Of Smell

●Our nose is a sensory organ of smell.

●The nostrils open into a hollow space called a nasal cavity.

●Mucous in the nasal cavity lines warms and moistens the air before it enters the lungs.

●The roof of the nasal cavity has many receptors and sensory cells to detect smell.

●Chemicals released by food, perfume and flowers into the air are known as smells.

●The chemicals dissolve in the mucous lining and stimulate the sensory cell which in turn, send out nerve impulses to the brain which interpret them as a smell.

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●We get used to a smell after smelling something for a long time.This is because the sensory cells stop sending messages to the brain.The sensitivity of smell differs from individuals.

Credit:http://pmr-science.wikispaces.com/1.3+The+Sense+of+Smell