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!