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The skin, part of the integumentary system.
9
votes
Why did humans evolved the scratch reflex?
The most common cause of itching is dry skin; tiny cracks in the skin cause an inflammatory response, which (within reason) is not a problem in and of itself. … One can treat dry skin, wash off irritants, treat infections, avoid causes, etc.
Scratching can be benign if done sensibly, or it can injure the skin, allowing infection, etc. …
6
votes
How hot can a beverage get without burning the tongue?
This depends on a lot of factors, including how you take your first sip. If you sip with air, you are altering the temperature of the liquid as you sip, as well as decreasing the volume of hot liquid …
9
votes
How lethal is high dose UV?
If, by chance you survived the first 24 hours, the blisters that break open (and they would) would get infected because your immune system would be compromised by the damaged capillaries of the skin (that's …
3
votes
Accepted
Healing of Skin Superficial Wound
Skin is composed of layers, the uppermost being the epidermis. … And, no, it does not contain the cells needed to regenerate the upper layers of the skin. …
25
votes
Why did evolution fail to protect humans against sun?
I find your question to be fine for this site, and you've provided the asked for sources, so it's fair to give you an answer.
Where is the error in my thinking?
The error is in thinking that evoluti …
4
votes
Can skin be removed and replaced so that it maintains its original cellular structure?
As pertains to skin, no. As pertains to your other fears, that's a different question. … Every cut that extends into the dermis significantly (and to remove skin, it must include the dermis) will leave a scar behind. …