How does the sense of smell work?
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It contains patches of millions of smell receptors called olfactory cells. Sensory hairs stick out from the surface of these receptor cells.
The hairs detect smells and pass information along nerve fibres to the brain. Substances that you recognize as having an odour dissolve in the layer of mucus covering the sensory cells, stimulating them to produce a signal.
Most people are able to detect about 4,000 different smells. However, people whose work is based on their ability to smell, such as chefs, perfume makers and wine tasters, can distinguish as many as 10,000 different smells.
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Date Added: 22 December '11
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