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Questions tagged [skin]

The skin, part of the integumentary system.

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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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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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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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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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Water loss through the skin

I just have a quick question. Do humans lose water through the skin because of the water potential difference between the inside of the cell and the outside of the cell? Shouldn't water leave the cell ...
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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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Can gold/silver nanoparticles enter though skin into capillaries?

There are a lot of topical products that contain gold and silver nanoparticles. When applied on skin, is there possibility of these nanoparticles entering blood stream(capillaries) through the skin? A ...
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73 views

Why are oil glands next to hairs in skin?

today I saw this picture and I saw an oil gland next to a hair. I was wondering what is the use, it came to my mind that it's to make the skin slide over the hairs while they were growing outwards. ...
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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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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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43 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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Is genetically given percent of fat stored under the skin higher for colder regions?

Is there a study on the dependence of the natural amount of subcutaneous fat and environment temperature? Is there a genetic difference in fat storing across human populations?
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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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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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181 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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436 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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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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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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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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55 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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Can you confirm the function of adipose tissue in the skin

Is it only to insulate and protect Organs. I wrote this (obviously in more detail) but my lecturer said that I need to write about the function in the skin, isn’t this it though. I’ve tried to do some ...
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279 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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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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248 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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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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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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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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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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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 ...
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543 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
195 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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247 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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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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170 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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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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845 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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203 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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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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404 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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120 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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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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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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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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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
967 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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722 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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493 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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848 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 ...
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41 views

How fast can our skin recuperate from sunlight?

Imagine that you get burned in the sun after half an hour. But a quarter and another quarter is also a half hour. So if you go into the sun 15 minutes and after one hour another 15 minutes do you get ...
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Can pathogens enter the bloodstream if the epidermis has been scraped off?

Assume that the epidermis has been scraped off by a fall (not just scratched). Also assume that the dermis is completely untouched. Does this allow pathogens to enter the body more easily, or does the ...