Nose and Nasal Cavities.
Smell is another very important sensation experienced by the human body. Though the human nose is not as sensitive as animals but it is well developed. Our nose detects smell just by picking up a few air borne molecules of any substance and can distinguish between different smells.
The sense of smell is strongest in babies. This sense helps them to recognize their parents.
The small patch inside the top of a nose relies on a small patch called the olfactory epitheliums. This small 6 cm square patch is equipped with 10 million smell (olfactory) receptors. These receptors send the information to olfactory bulb, which further relay messages to the brain. The number of receptors stimulated tells you just how strong a smell is.
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