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Skin & water

wet

Freediver82 - water borne
https://www.academia.edu/36514226/I...verse_osmosis_in_humans_surviving_the_Miocene

Infiltrating transdermal reverse osmosis in humans; surviving the Miocene

Abstract
Reverse osmosis is a well documented function of the eccrine glands. The epithelial sodium channels in the apical membranes of the eccrine gland ducts reabsorb salt before perspiration is excreted to maintain water and salt homeostasis.
[1]
A series of experiments was devised to determine the following matters: whether water can be absorbed through the skin; if so whether the amount of water absorbed is sufficient for normal hydration and thirdly whether reverse osmosis can operate in both directions, that is, whether a person immersed in sea water could absorb water through the sweat glands and, if so, whether surplus salt would be excreted via the kidneys or filtered out by the sodium channels before absorption. An adult male subject underwent a series of immersions and measurements were taken of changes in weight and the quantity and density of urine produced. It was found that fresh water was absorbed at a rate sufficient to maintain normal hydration in both fresh and salt water. In evolutionary terms this mechanism would have provided a means of surviving a drought of any duration simply by adapting to a seafood diet, whereas land based hominins would perish after just a few days without water.
 
OP
OP
W

wet

Freediver82 - water borne
https://www.academia.edu/36514226/I...verse_osmosis_in_humans_surviving_the_Miocene

Infiltrating transdermal reverse osmosis in humans; surviving the Miocene

Abstract
Reverse osmosis is a well documented function of the eccrine glands. The epithelial sodium channels in the apical membranes of the eccrine gland ducts reabsorb salt before perspiration is excreted to maintain water and salt homeostasis.
[1]
A series of experiments was devised to determine the following matters: whether water can be absorbed through the skin; if so whether the amount of water absorbed is sufficient for normal hydration and thirdly whether reverse osmosis can operate in both directions, that is, whether a person immersed in sea water could absorb water through the sweat glands and, if so, whether surplus salt would be excreted via the kidneys or filtered out by the sodium channels before absorption. An adult male subject underwent a series of immersions and measurements were taken of changes in weight and the quantity and density of urine produced. It was found that fresh water was absorbed at a rate sufficient to maintain normal hydration in both fresh and salt water. In evolutionary terms this mechanism would have provided a means of surviving a drought of any duration simply by adapting to a seafood diet, whereas land based hominins would perish after just a few days without water.
---

Sea Lions Develop Human-like Vernix Caseosa Delivering Branched Fats and
Squalene to the GI Tract
Dong Hao Wang, Rinat Ran-Ressler, Judy St Leger, Erika Nilson, Lauren
Palmer, Richard Collins & J Thomas Brenna 2018
< https://www.nature.com/articles/s41598-018-25871-1#auth-7>
Scientific Reports 8:7478
doi 10.1038/s41598-018-25871-1

VC (the white waxy coating found on newborn human skin) is thought to be a
uniquely human substance.
Its signature characteristic is exceptional richness in
- saturated branched chain fatty acids BCFA &
- squalene SQ.
VC particles sloughed from the skin suspended in amniotic fluid are
swallowed by the human fetus, depositing BCFA/SQ throughout the
gastro-intestinal tract, thereby establishing a unique microbial niche
that influences development of nascent microbiota.

Here we show:
late-term California sealion Zalophus californianus fetuses have true VC,
delivering BCFA & SQ to the fetal GI tract, thereby recapitulating the
human fetal gut microbial niche.
These are the first data demonstrating the production of true VC in a
species other than Hs.
Its presence in a marine mammal supports the hypothesis of an aquatic
habituation period in the evolution of modern humans.
 
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