Smell
In order for you to smell something, molecules from the thing you're smelling have to
enter your nose. Everything you smell, therefore, is giving off molecules. Those molecules are usually small, easy to evaporate chemicals that float through the air into your nose. A piece of metal has no smell because nothing evaporates from it. These molecules floating into your nose are called
odorants. They stimulate sensory nerve cells (neurons) in the
olfactory bulb called
receptors, which send electrical impulses to the brain.
The olfactory bulb contains other receptors called
trigeminal nerve receptors. The trigeminal nerve (which is the largest cranial nerve, connecting the face, teeth, and mouth to the brain) provides a second set of nerve endings which are responsible for touch, pressure, pain and temperature sensations in the mouth, eyes and nasal cavity.
Certain chemicals produce effects described as hot, cold, tingling or irritating when detected by the trigeminal nerve. For example, menthol produces the feeling of cold (or hot, in high concentrations); the chemicals
capsiacin in hot chili peppers and
diallyl sulfide in onions also stimulate this nerve.
Human beings have a very weak sense of smell, and it doesn't always work well. When we have a cold, excess mucous blocks the receptor cells, and we have trouble smelling. When we smell the same odour for too long, the receptor cells get 'tired', and stop sending signals to the brain, so we stop smelling the persistent odour.
Followings Are The Nose Conditions :
- Hay Fever
- Nasal Cancer
- Nose Disorders
- Sinusitis
- Taste and Smell Disorders
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