Friday, 12 May 2017

Humans have a poor sense of smell. It's just a Myth.



The Smell Report

The human sense of smell
Human olfactory abilities have been underestimated and are just as good as those of other mammals, says neuroscientist.
Our smelling function is carried out by two small odour-detecting patches – made up of about five or six million yellowish cells – high up in the nasal passages. 
For comparison, a rabbit has 100 million of these olfactory receptors, and a dog 220 million. 

Humans are nonetheless capable of detecting certain substances in dilutions of less than one part in several billion parts of air. We may not be able to match the olfactory feats of bloodhounds, but we can, for example, ‘track’ a trail of invisible human footprints across clean blotting paper.

The human nose is in fact the main organ of taste as well as smell. The so-called taste-buds on our tongues can only distinguish four qualities – sweet, sour, bitter and salt -all other ‘tastes’ are detected by the olfactory receptors high up in our nasal passages.

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