> males exhibit a disproportionate increase in nasal size
So it's not because men tell more lies?
Knobbly male hooters are much larger than women's diminutive noses because of lean muscle mass, a new study has uncovered. We learn from researchers at the University of Iowa that the snouts of blokes of European descent – even when taking into account men and women's relative sizes – are much bigger. This is apparently in …
If you wanted to get good air flow through a nose, you'd make (evolve) it to be short with wide nostrils.
Is it possisble that the larger male nose is intended partly for sexual signalling. It sounds fanciful to modern minds, but consider prehistoric hunter-gatherers grouped together in the middle of winter. They'd be wrapped up in identical looking thick furs with long untidy hair and the only distinguishing features would be their grimy faces. Eyebrows, mouths and chins (in general) show sex related differences in appearance, so why not noses too?
Noses serve other functions besides just raw air flow and three come readily to mind; heating, humidification and filtration. Much of these function is handled by the turbinates and mucosa which are, hopefully, in the less visible parts of the nose. While the nose does a good job, airlines and scuba systems pose particular problems to respiration in that airplanes tend to have very dry air leading to nasal discomfort and scuba systems typically require breathing through the mouth leading to increased dehydration and heat loss. This is magnified for technical divers breathing tri-mix as it contains helium which is an excellent thermal conductor.
"But then the air getting to your lungs has been neither filtered (nasal hair and mucous membranes) or warmed."
Not quite accurate. It's *less* filtered. There still is the mucosa of the trachea and bronchial system. The same is true of heating as well.
It's just far less effective and coarse objects, such as small insects, aren't filtered so well by one's mouth and trachea.
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