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#nose

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Investigating the case of human nose shape and climate adaptation
journals.plos.org/plosgenetics
#ycombinator #Nose #Humidity #Genetics #Europe #Phenotypes #Population_genetics #Single_nucleotide_polymorphisms #Genetic_drift

journals.plos.orgInvestigating the case of human nose shape and climate adaptationAuthor summary The study of human adaptation is essential to our understanding of disease etiology. Evolutionary investigations into why certain disease phenotypes such as sickle-cell anemia and lactose intolerance occur at different rates in different populations have led to a better understanding of the genetic and environmental risk factors involved. Similarly, research into the geographical distribution of skin pigmentation continues to yield important clues regarding risk of vitamin D deficiency and skin cancer. Here, we investigate whether variation in the shape of the external nose across populations has been driven by regional differences in climate. We find that variation in both nares width and alar base width appear to have experienced accelerated divergence across human populations. We also find that the geospatial distribution of nares width is correlated with temperature, and absolute humidity, but not with relative humidity. Our results support the claim that local adaptation to climate may have had a role in the evolution of nose shape differences across human populations.
Bruce Elrick

Fun fact. Have you heard about the nasal cycle, an alternation of the amount and speed of airflow through either side the nose with a period of about 2.5 hours?

I had noticed it in myself forever ago but had never heard anyone talk about it until some day in the last 10 years I searched for it and found that it was a well-known phenomenon.

The scent sensitivity range benefit is something I only learned today as I read the Wikipedia article.

en.wikipedia.org/wiki/Nasal_cy
#science #nose

en.wikipedia.orgNasal cycle - Wikipedia
やぎ

#WednesdayWisdom 🗞 8AM＠JP
#知見の水曜日 あさ8時 🗞 おはよう 御座います

Humans breathe through their #lungs, taking in oxygen through the #nose and #mouth.
The skin contains sweat glands that release sweat, but this does not involve breathing.

It's important to be cautious when obtaining information. 👐

　
人間は #肺呼吸 のために #鼻や口 から空気を取り込んでいます
人体は皮膚にある汗腺から汗を排出しますが、それによって呼吸することはありません

情報を得るには注意が必要です👐
#aiart #wrtn #Claude3

「人間は皮膚呼吸しないと死ぬ」というのが嘘の理由 [医療情報・ニュース] All About
allabout.co.jp/gm/gc/461103/

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