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Questions tagged [skin]

The skin, part of the integumentary system.

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What is the naime of this things? [on hold]

What are the names of these green things and what is the name of the red and blue layer on top Latin answers are fine.
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32 views

How hot water burn works?

At age of 6 I accidentally dipped my hand into a boiling indian curry(Sambar) which was in a large pot. I got a Boiling Water Burn(Just like in the picture but with a little more radius) in my hand ...
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Evolution of scratching

Is scratching (aka the scratching reflex) thought to be inherited from a single vertebrate ancestor or is it something that evolved several times e.g. in birds, mammals etc., i.e. is it a case of ...
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18 views

What part of the skin is damaged under sun exposure?

How exactly does extensive sun exposure lead to skin damage and increase cancer risk. In which part of the skin is the sun doing the most damage. Is it in the epidermis or beneath ? I would like to ...
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31 views

Oil absorbed into human skin — where does it go?

For example, I apply petrolatum to my dry hands twice a day as in winter I am usually in a 20-30% RH environment. Within an hour, the petrolatum seems entirely absorbed. According to [1], ...
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76 views

What are the (statistically) normal pH levels in the most-outer part of human sexual organs?

What are the (statistically) normal pH values of the outer skin/epidermis of human sex organs (groin/crotch) in the male and female? e.g male testes, female vulva, male glans, the enveloping epiderm, ...
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1answer
62 views

How are fingerprints formed?

I know what influences the fingerprints to be unique always. But what actually process is taken to make these as we grow?
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1answer
201 views

Is there any difference between fascia and skin ?Are both the different names of the same thing?

Skin is the outermost layer of the body ,and it consists of two layers; epidermis and the second layer the dermis .There is another layer the (third layer) beneath the dermis called superficial fascia ...
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1answer
89 views

Skin Colour in “Northern” Regions of The earth

Question: Netflix has recently produced a two-part miniseries, The Evolution of US, that examines the evolution of "man". The topic of of human skin colour was covered and it was stated that 'lighter ...
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1answer
36 views

why finger of hands and feet become wrinkled due to to water? [duplicate]

Mostly due to bathing or washing clothes our finger become wrinkled what was the reason behind it??
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1answer
35 views

Skin (histology)

Our instructor share this image with us. She didn't specify much. She only said it was a skin sample. Could you tell me what is the thing that was pointed at with the blue arrow? I believe that I ...
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0answers
70 views

What is the evolutionary advantage of getting hard nipples when being aroused? Why can they even be stimulated sexually?

I try to understand the evolutionary advantages of the body reactions of nipples and penises/vaginas. I'm confused, because I can explain the evolutionary advantage in a logical & consistent way ...
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1answer
38 views

Which kind of drugs get absorbed through epidermis?

Some drugs such as nicotine can be administered through skin. I thought the layers of skin are designed to prevent in-flow of any chemical/germs. Not all drugs get absorbed in this fashion. So do ...
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0answers
39 views

How are animal patterns encoded in the dna?

After seeing the patterns on the feathers of a argusianus argus pheasant (shown below), I am curious where is the information that encodes a pattern for a particular bird, and what form is this ...
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1answer
45 views

Why do scabs itch?

I have noticed that scabs formed over wounds itch a lot. And if the scab comes off then the skin rarely completely heals and a scar is left. Assuming scabs are important for the healing of skin ,...
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0answers
33 views

Is swimming pool water actually a weak topical medication?

I was inspired by this question. Given that the chlorine levels in swimming pool water are so high that they can seriously harm amphibians, it seems logical that the water should also kill various ...
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58 views

Are there wounds which never completely heal?

I have a cut on a knuckle which occasionally opens (usually during winter), to disappear after some time (it is usually fine during the summer). This is going on for years now and yes, I will show ...
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1answer
279 views

What kind of factors determine how someone looks according to their race or ethnicity?

From what I read, race is considered the biology, the physical traits inherited by ancestry. Ethnicity and nationality have to do with social construct and cultural identity. This is almost the same ...
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1answer
629 views

Why does UVA penetrate deeper than UVB, though it's weaker?

Even though UVA radiation ranges in longer wavelengths (315–400 nm) than UVB (280–315 nm) and thus is less energetic, UVA is able to penetrate deeper into the skin and even reach the dermis. Why is ...
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114 views

Can skin acclimatize to a the humidity level?

When the outdoor temperature is low, the absolute humidity is low because cold air holds less water. When the heat is turned up indoors the relative humidity decreases and during days with cold ...
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0answers
97 views

Mammalian scales

Many small mammals have scaly skin on their tails and sometimes limbs. The examples can be found among rodents (rats, degu, scaly-tailed squirrels), insectivores (shrews, desmans), oppossums, musky ...
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1answer
60 views

Why is the skin of European bog bodies brown?

What causes this? Is it to do with decay or is it to do with substances within the bog dying the skin?
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1answer
67 views

What Animal is This Skin From? A Wooly Mammoth?

I was at the American Museum of Natural History in New York City today, and I saw the skin pictured below. Because it was next to stuff about wooly mammoths, I thought it might be a mammoth skin. ...
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1answer
443 views

Function of Smooth Muscles in the skin

I understand that the overall function is voluntary movement, but is it the same in the skin? Is the main function in the skin movement or is there a greater function? Could anyone could provide this ...
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51 views

What causes the blue color seen in baboons?

Based off of this question from Worldbuilding SE. In that question, I talked about how the scrotum and buttocks of various animals have a blue color because of thick deposits of collagen in those ...
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1answer
368 views

What counts as a 'breach of the skin' for infections(like rabies) that spread via wounds?

I've been looking at several sources on how the virus spreads and they all mention that the skin has to be broken, but does it mean broken to the naked eye? A minor scratch where the skin appears ...
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0answers
21 views

How can botox cure wrinkels?

How can botox cure wrinkels? Do wrinkles caused by tension of some muscles in the skin? Can these muscles be relaxed by hypnosis or training?
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3answers
1k views

Do skin mites reproduce on human face during night?

I've seen this circulating on social networks: I was wondering to what extent is it true. Do skin mites really get on the skin surface to reproduce? Why is it so?
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111 views

Effect of UV radiation on retinoid (vitamin A) receptors in the skin

The retinoid receptors in the skin (face) can be disabled by UVA sun radiation as these study states : https://www.sciencedaily.com/releases/1999/03/990331063314.htm In this article it says the same :...
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1answer
1k views

If cells regularly renew, why do we have scars?

Question may sound bit poetic but I have a pretty basic question here: Often we get a minor wound and cells renew and quickly "cover" it. But when we have deeper wounds, often they leave behind scars. ...
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0answers
31 views

Human's capacity to withstand extreme heat in dry air [duplicate]

What is the maximum temperature a human can withstand for short periods of time in an environment with dry air (e.g. oven @+300F, other confined spaces) and what would be the immediate risk of being ...
3
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1answer
656 views

Why did evolution make people's skin dark?

Why do people living in the equator have dark skin? I know that Melanin acts as a protective biological shield against ultraviolet radiation. But doesn't black absorb all light in a way making the ...
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3answers
218 views

Why sun rays don't burn our skin?

Can you explain (or direct me to a link) the process by which a photon of $8.10^{14}$ Hz is absorbed by the skin without damage, whilst a slightly more energetic one (UVB) makes damage? What area of ...
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1answer
307 views

Why the smell of sweat greatly varies across the body?

Having only two types of sweat glands (eccrine, apocrine) I would expect the sweat odor "spectrum" to be very "narrow". However, the smell of sweat greatly varies between scalp, arms, armpits, groin ...
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0answers
46 views

Is the skin of feline jungle predators protected against ants?

I was watching a video of a jaguar stalking along a riverbank, killing prey, climbing up the muddy bank, then laying in thick brush to eat. My first thought about this is that there must be tons of ...
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1answer
201 views

How are collagen fibers in skin aligned with respect to skin surface?

I read in one paper that collagen fibers in dermis are randomly oriented in direction with respect to the skin surface. I can't locate that paper now. However, I came across this paper that indicates ...
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0answers
44 views

Has aloe vera been proven to help heal burned skin areas?

I don't like buying into "natural remedy" type things without seeing scientific proof behind them. There's an almost universal belief that aloe vera helps to heal burned skin, and whether that ...
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1answer
1k views

How is sebum secretion regulated?

The principle of homeostasis in biology says that living organisms try to maintain some sort of equilibrium. Doing that requires the use of feedback mechanisms to regulate things like temperature, ...
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1answer
264 views

Why all human beings not black in color?

Archaeologist & Historians strongly claiming Human beings originated from African continent, Where default color is Black for humans. Why all human beings not black in color?
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2answers
548 views

Why do redheads tend to sunburn more easily?

Reading Marion Roach's book on redheads she mentions visiting Rees lab where he shines UV light on her skin. Apparently this is an ongoing experiment of his regarding the propensity of redheads to ...
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1answer
577 views

Why hand washing causes skin to dry?

This seems counter intuitive: dry hands mean low humidity, so why when humidity is increased, by washing hands, they become even more dry, eventually? In particular, why such hand dryness is usually ...
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1answer
136 views

How harmless bacteria on skin defence against harmful bacteria?

I have read that there are some harmless bacteria live on skin and they also have role in protecting body against some harmful bacteria but how do they do so? I mean how these bacteria are able to ...
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0answers
31 views

Do macrophages engulf material in the epidermis?

This question comes from how tattoos work. From what I understand, the ink particles are something like 100 nanometers in size, which is too big for macrophages to remove them in the dermis. What I ...
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1answer
2k views

Can viruses pass through sweat pores?

I have read somewhere that viruses and other microbes can not penetrate skin but what about sweat pores? Can viruses pass through these pores?
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35 views

How do you identify this particular snake shedding?

Aloha, Snakes are illegal in the State of Hawaii, with the exception of the Hawaiian Blind Snake (Brahminy Blind Snake (Ramphotyhlops braminus)). I've read through a plethora of articles to no avail....
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1answer
2k views

Why do we see black when we close our eyelids? [closed]

Why do we usually see black when we close our eyelids assuming there is no strong light source outside? I realize we never really stop seeing as long as our eyes are healthy but based on assumption ...
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1answer
1k views

Why do some moles grow longer and darker hair than the rest of the skin?

In different parts of the body I have skin moles or in medical terms, nevus. In some of them hair grow seemingly either darker/thicker (I'm not sure how much of the two) and notably longer. Here are ...
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0answers
797 views

What was the first animal having fur?

Did all early mammals have fur? Is it possible to trace the origins, how early animals with fur looked like and how it evolved?
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1answer
639 views

What causes pinkish hue to some skins? [closed]

I know it is caused either by blood vessels beneath skin , or some pigment called "pheomelanin" . But what is it in fact?
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2answers
1k views

Why do we like to touch fluffy things?

I read this article but it didn't explain much. Is the fact people like to cuddle pets with fur connected anyhow with our past when our ancestors had fur as well - and therefore could evolve an ...