Questions about the integumentary system of vertebrates.

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How and why do skin tags develop?

WebMD writes: Skin tags are small, soft pieces of skin that stick out on a thin stem. They most often appear on the neck, armpits, upper trunk, and body folds. The cause of skin tags is not known. ...
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0answers
38 views

Model for Oxygen diffusion into tissue? [on hold]

Currently I have an idea and want to research it's feasibility. I want to know how oxygen or any other particle could diffuse into the body through small holes in the skin. is it possible to ...
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1answer
19 views

Influence of artificial sunlight on the human body

In a hypothetical scenario, where a large, permanently manned craft is in a continual orbit, and natural sunlight cannot be used as the craft may keep moving and turning, artificial sunlight is used ...
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0answers
44 views

Do “scars” in humans replace all the skin layers or only some layers?

When someone has a cut or surgical incision that results in a "scar", is the scar tissue replacing all 3 layers of the skin (epidermis, dermis, hypodermis)? Or only the first one or two of them?
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1answer
34 views

Can skin be removed and replaced so that it maintains its original cellular structure?

The cells in our body that form tissue, such as our skin, are interconnected. I would think that cutting out tissue or trying to repair/replace it, as is done in surgery, or after an injury, could not ...
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18 views

metabolic heat generation and exercise intensity

Is there a relationship between bio heat equation (found here) and exercise intensity as described here That is I am trying to include the effect from exercises to the tempertaure variation in skin. I ...
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0answers
30 views

How thick is the residue from a fingerprint?

I am trying to work out the mass added to a small glass sphere when it is picked up with bare fingers.
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0answers
38 views

Is the fingerprint regenerated?

Let's say you get a a cut on your finger. Will the fingerprint be regenerated to matched your original fingerprint and if so, how?
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38 views

Liquids with high rate of evaporation and high latent heat that can be safely be put on your skin

If it is warm we sweat, allowing our bodies to cool down using evaporative cooling. However, if it is very humid, this doesn't work well anymore. One can then try to stay cool by putting a liquid ...
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1answer
59 views

Is it possible for a person to eat so many carrots that one turns orange?

I once read that Jerry Rubin (a famous 1960s activist) ate so many carrots that he turned orange. (This was in the East Bay Express, around twenty years ago.) I assumed it could be true, though he ...
3
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1answer
114 views

My hand was stabbed with a pencil tip 10 years ago - why is the graphite still visible?

I, and multiple people that I know, have permanent marks (up to 30 years) from a graphite pencil puncturing the skin. The palm of my hand still shows a very clear mark where my hand was punctured by a ...
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0answers
17 views

What Effect Does Skin Redness Have On Underlying Tissue?

When someone applies a rubefacient ( something that increases blood flow to the skin, turning it red), what effect does this have on the underlying tissue? Is blood supply increased radially from ...
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0answers
102 views

Why are lips covered with specialized skin?

I found out some interesting facts while studying our lips: They are covered in glabrous skin, while most of the skin surface is hairy; The outermost layer (stratum corneum) of the skin is far ...
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0answers
13 views

Why do we itch? [duplicate]

Here I have a simple question why do we itch? Is it because of some alteration of the skin or just a reflex action by the CNS? I am asking for a reasoned scientific answer to this.
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2answers
53 views

Is the sun's damage to skin sufficient to warrant protection anytime the average person goes outside or just for extended periods?

According to the American Academy of Dermatology website, Everyone needs sunscreen Sunscreen should be used every day if you will be outside. The sun emits harmful ultraviolet (UV) rays year round. ...
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2answers
5k views

Why do tattoos persist if body cells are regularly renewed?

I am not quite sure if it is true, but I read somewhere that within 7 years all the body's cells are replaced with new ones. I am not quite sure if it is cells or atoms. If it is then why do tattoos ...
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2answers
553 views

How does a smoker's finger or mustache get yellowish by nicotine?

Tobacco use is the leading cause of preventable death around the world.$\ce{^1}$ The stain is considered as a "tell-tale" sign for identifying smokers. Multiple materials stated that it's due to ...
2
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1answer
108 views

Skin color explanation?

I do not understand how skin color in humans work, even after taking a basic genetics course and reading some on wikipedia. From what I understand, skin is color based on multiple genes that control ...
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0answers
24 views

Herbal remedies for damaged tissue [closed]

What is the mechanism of action of Arnica oil to repair damaged tissue? Which preparation of Arnica is more effective - an oil-based or water-based extract?
4
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1answer
90 views

Do sweat pores change diameter?

In Cholinergic Urticaria, some people believe that the itching which is generally more in winters might be because that the diameter of sweat pores is less due to less activity(less sweat production) ...
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2answers
504 views

Why did humans evolved the scratch reflex?

I've been wondering about this for some time, and I can't come to an answer... Everybody keeps telling me that scratching one's own skin is bad. It damages the epidermis, creates the hazard of ...
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1answer
146 views

Why are skin tactile receptors considered to be phasic receptors?

A phasic receptor by definition is one that quickly adapts to change. In terms of neuron firing, this means that it does not trigger another firing because the receptors are used to the stimulus. But ...
4
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1answer
69 views

Can anti-aging cream work?

I have a friend who told me that anti-aging cream cannot work to reduce wrinkles as it only penetrates x amount of skin layers and can never make a long term effect. Me not knowing much about how ...
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1answer
383 views

What causes the line patterns in the palm of the hand?

The line patterns on the hand are unique to each individual, but what causes these lines and re they advantageous in anyway?
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1answer
1k views

What is our skin made up of?

Again, it is a basic question. What is our skin made up of? is it made up of many cells arranged in a systematic way or is it just like any layer say of a book?? what is the difference? where is the ...
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3answers
86 views

Can a portion of human skin cells be modified in some way to generate light? [closed]

I have come across some species of living organisms who are able to emit light at whim. Can that ability be incorporated into a portion of human skin (a specialized tissue)?
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2answers
140 views

Why can good music raise goosebumps?

Listening to really good music right now, I was wondering why it raises goosebumps. Is there any physiological reason for this reaction to specific wavelengths or something? EDIT: Due sometimes ...
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3answers
702 views

Do humans perceive temperature or heat-flux? (or both?)

The general understanding is that when I touch an object, I perceive its (relative) temperature. A metal object at room temperature, however, will often feel cool to the touch. This leads me to ...
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1answer
206 views

Why is hyper pigmentation the common aftermath of skin lesions and abrasions?

I'm aware that melanocytes produce melanin, giving color to the skin, but why are these cells recruited or overactive when healing skin abrasions, lesions and sores when T-cells and inflammatory ...
6
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1answer
251 views

Why are particular laser-related skin products not recommended for darker skin tones?

This is about products such as: The "Theradome" laser helmet (this claims to stimulate hair growth through lasers) Theradome™, a biomedical engineering company based in the Silicon Valley, is ...
5
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1answer
45 views

Is there any conclusive study relating the food consumed and the occurrence of acne?

The internet says a million things about what to eat and what not to in case of acne. For instance: Refrain from dairy products. Refrain from food heavy in unsaturated fat. Refrain from too much ...
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0answers
146 views

The skin color of bonobos

Why is that bonobos skin color on the areas not covered by hair are dark throughout life unlike the chimpanzee?
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1answer
59 views

What is different between the pigment of giraffes and the pigment of flowers?

I saw this video created by Derek Muller and he says there that it is very unusual to evolutionary develop the colour of the skin without the pigment. That sounds reasonable but if so, what nutrients ...
3
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1answer
209 views

Why are Merkel cells innervated by an axon, and not a dendrite?

Here are two images from Google. Afferent neurons receive input and send it to the central nervous system. Input is received by the neuron's dendritic end and send away centrally via axon terminals ...
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2answers
4k views

How hot can a beverage get without burning the tongue?

What is the maximum temperature that a beverage can be without burning the tongue? I suspect there's a maximum temperature that the surface tissue of a tongue can withstand without being damaged ...
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0answers
98 views

Dead skin cell decomposition

What would be the resultant by-products of a completely decomposed dead skin cell? What would be the size of each of the by-products of a decomposed dead skin cell? How long would it take for a dead ...
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0answers
42 views

Why does some skin hold perfume longer than others

I was wondering my girlfriend and I used the same perfume for a while and we sprayed the same place. And after a day her skin still smells nice while mine smells normal. Will different types of ...
5
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1answer
937 views

Why do some cuts leave scars, while others do not?

Last year I got a moderately-deep cut on my finger, and it left a scar. Six months later, the scar is still there. On the other hand, I've had lots of other cuts on my fingers, though none have left ...
2
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0answers
34 views

How much time is required between repeated exposures to sun to prevent sunburn [closed]

After being in the sun, how much 'rest' is required before you can expose yourself again? e.g. from Wikipedia: Sunburn can occur in less than 15 minutes So if you were in a place where sunburn ...
2
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1answer
282 views

What is the chemical process involved in human hairs changing colour after sun exposure?

After a day at the beach, my skin tans due to Melanin. But I also observe the black hairs on my arm turn a blond colour. My question is What is the chemical process involved in human hairs ...
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2answers
3k views

Why doesn't the human skin grow back exactly how it was before being damaged?

Very simple: Why (and how) is regenerated skin different from original ? As we know we lose skin cells that becomes the dust in out homes and it always grows back to full thickness right ? So when I ...
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1answer
171 views

Any relevant knowledge/studies about voluntary goose bumps [duplicate]

I'm not entirely sure how normal this is, but since I was a child, I've been able to produce myself voluntarily a "chill" sensation that seems to start on my head and traverse the rest of my body, ...
2
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0answers
2k views

Why does skin sometimes suddenly itch when you stretch it? [closed]

Sometimes, when I bend over, areas of my skin like my back can suddenly itch quite intensely. Sometimes it may be another part of my body and the pattern seems to be a part of the skin organ that is ...
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1answer
99 views

Can skin become denser?

I heard that after injury or repeated damage bone becomes denser, can skin become denser as well?
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1answer
630 views

Consequence of touching Formaldehyde

I accidently touched formaldehyde some days ago. Skin on my hand got dehydrated as if I had placed it in salt solution. I washed it with water and it returned to normal state after 5 minutes. But now ...
0
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1answer
76 views

Pathogenesis of chronic venous congestion in skin?

I think CVC cannot lead to heart failure primarily. So let's think its pathogenesis in skin now only. I think the pathogenesis is like this dilation of veins and capillaries due to impaired venous ...
0
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1answer
28 views

S. pyogenes' skin infection diagnostics

S. pyogenes is "flesh-eating" bacteria. It results from life-theatening myonecrosis caused by this organism. S. pyogenes avoids phagocytosis (mediated primarily by capsule, M and M-like proteins, C5a ...
1
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1answer
101 views

Physiology of skin and leather: why do salt borders occur?

I discussed a leather store about the white border aka salt border on leather shoes. They said that it is due to inner features of leather and you could try to add some fat/cream to push it back ...
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4answers
234 views

Significance of having goosebumps?

What help does goosebumps do to us? I don't think it helps us noticeably when we are scared or shivering.
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2answers
265 views

Are there free electrons in muscles, hair, or skin?

Electric shock occurs upon contact of a (human) body part with any source of electricity that causes a sufficient current through the skin, muscles, or hair. In metals many electrons are said to be ...