More about the skin

On my last post I directed my attention on the more minor parts of the integumentary system - the hair and nails. This post I will be paying more attention to the skin.

When you are young, your skin fits snug and grows with you. After age 25 your skin becomes less flexible and wrinkles and creases start to appear.

Why do people have different coloured skin?

Melanin is what gives skin and hair it's colour. Everyone has about the same amount of cells that make melanin, but the cells of darker skinned people make more melanin than lighter skinned people, mostly because of different climates in different countries.

How does the skin work with the other systems?

Working with the Circulatory system

- When the body needs to cool down, more blood flows through capillaries near the surface, which is good news for thirsty mosquitoes!

- If you cut your skin and start to bleed, platelets start to form a clot to stop the bleeding. A scab eventually forms and after the skin has healed itself the scab falls off.

Working with the Muscular system

- Goosebumps: Each hair on your body is attached to a muscle cell below. The muscle cell gets shorter whenever you are cold or scared. This makes the hair stick up which makes the bump we call a goosebump.

Fun Facts About Skin

- More than a trillion bacteria live on the skin's surface.

- In a lifetime the skin sheds around 40 pounds.

- Your body sheds about 50,000 flakes of dead Skin every minute.

- The thickest skin on your body is on the soles of your feet and the thinnest skin on your body is on your eyelids.

And that is all for my skin hair and nails project. See you next time!


Original Post

Hey Sarah!

Great job organizing your research in a way that makes it easy to understand for your readers! Learning about how goosebumps work was really interesting as I've always wondered how they work, but I never took the time to do some research on it. I think it would be really fascinating if you did more research on goosebumps. You could look into why we get them, how it fits into human evolution and if any other animals get them (goose, maybe? ). 

Here are some sources that may be of use: 

Good luck!

Hey Sarah,

This was a great round of research! It was quite informative and was laid out in an easily-comprehensible way. I learned a new fact about goosebumps, and agreeing with what Heeva mentioned above, it'd be really interesting if you elaborated a bit on this topic, especially by maybe doing a comparison with our reaction to those of other animals. 

Well done!


Hey Sarah,

Nice topic researching about the skin.You have educated me a a lot of facts about the skin and also where the skin get their color and also the hair.I would like to mention a little bit about the epidermis;The epidermis is the top most layer of the skin. The epidermis has no blood supply, but it is nourished by the blood vessels in the dermis. The thickness of the epidermis is usually 0.5-1mm, but is depend ant upon the site .

The dermis is also a useful part in the skin, the dermis also contains capillaries  and lymph nodes the blood vessels carry oxygen and nutrients and lymph nodes for protecting it from micro organisms. It is responsible for the skin's pliability and mechanical resistance and is also involved in the regulation of the body temperature. The dermis supplies the a vascular epidermis with nutrients by means of its vascular network. It contains sense organs for touch, pressure, pain and temperature.Like you are supposed to tell us what is makes an old and a young person look different from one another.

Here i got a link which may help you;


Hey Sarah, 

Great round of research! I like how you split up your content into systems and fun facts about the skin. I learned many new things such as the amount of skin cells we shed, and how the thinnest skin we have is on our eyelid. For your upcoming rounds of research, I would suggest looking into animal's "skin". This could be their scales, feather, fur, etc and you could possibly compare it to human skin and contrast their functions. If you are interested in looking into this, here are some links:

Hope this helps!

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