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Integumentary System

For Science class.

Julia Gao

on 5 January 2012

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Transcript of Integumentary System

The Integumentary System By Julia, Margaret, and Rebecca. Integumentary System
The Integumentary System is the outer layer of your body. It consists of hair, skin, and nails. Skin Your skin has three layers; the epidermis, dermis, and subcutaneous. Your skin is your integumentary system, it and everything it contains. It is an organ, the biggest one you have. It is also your main physical protection system, it covers you and protects your vital organs.
The epdermis also protects you from injury. When
you get an injury, platelets stick together at
your injury, forming a clot to prevent any more
blood from flowing out. Fibrin holds the platelets
together. This forms a scab. A scab only takes a few hours to form, but can take a few days to fall off. Underneath all that, cells are coming together to form new skin, and the scab falls off on it's own after a while. Sweat Glands Hidden text! If you found this, you are bored! Sweat glands are what part of what maintains homeostasis.
When the day is hot, your skin produces sweat to cool you off. However, after you sweat, water is needed in your body. That is why you tend to drink a lot of water in hot days. Sweat also helps to get rid of any small waste material. Sebaceous Glands The sebaceous glands give off sebum, which waterproofs your skin and hair. This however causes several medical conditions, such as acne. Skin protects you from sunburn by secreting a substance called melanin. This is counter intuitive because your skin does get sunburned, but it would be a lot worse without melanin. This substance can make your skin darker. Panthers are a typical example
of melanistic animals. They really are just melanistic leopards. A diagram of a bit of skin. Hair has many uses. Our eyelashes and eyebrows keep dirt and other particles out of our eyes, and hair is also our main insulation system, along with the hypodermis/
subcutaneous layer. Touch, although mainly a part
of the nervous system, also plays
a role in the integumentary system.
When you touch something, nerves in your dermis register it, and send a message to your brain.

Skin also has the ability to absorb Vitamin D through ultraviolet light. This is the reason Vitamin D is nicknamed "The Sunshine Vitamin", because ultraviolet light mainly comes from sunlight.
The part of your body where your skin is the thinnest is your eyelid.
As an adult, you can have more than 20 square feet of skin.
You are likely to shed some 40 pounds of skin in your lifetime. Diseases Information Bibliography
"Integumentary System." Wikipedia, the Free Encyclopedia. Web. 28 Nov. 2011. <http://en.wikipedia.org/wiki/Integumentary_system>.

"The Integumentary System Shields the Body." Science Grade Seven. Evanston: McDougal Littel, 2005. 83-88. Print.

"Biology4Kids.com: Animal Systems: Integumentary System." Rader's BIOLOGY 4 KIDS.COM. Web. 28 Nov. 2011. <http://www.biology4kids.com/files/systems_integument.html>. Many small problems, like acne and zits, are caused by various functions of the integumentary system. Analogy
Lets compare the integumentary system to a house. A house is actually a lot like a human being. It's complex, has many different functions and has an outer shell over the inside, which represent the organs of a human body. The integumentary system is the skin, nails, hair and sweat glands. The bricks or wooden outside of the house functions like the skin. The pipes outside of your house act like sebaceous glands and keep the house dry. Windows are a bit like sweat glands, when opened they can cool the house. You might think we would compare air conditioning to sweat glands, but air conditioning isn't natural. It's an addition to the house for comfort, not necessity. So an air conditioning system might be equated to sunscreen. Helpful, but not completely necessary and not automatically built in. Also, the outside of the house protects the inside from things like bad weather, which are similar to diseases. The integumentary interacts with a lot of systems, but mostly it interacts with the immune system. Your skin is the first line of defense against harmful bacteria and germs. Parts of the Skin Layers of the skin (outermost to innermost):
Epidermis: The outermost layer of your skin. It is mostly made up of dead skin cells, and the frontline defense for the immune system.
Dermis: The mext layer down, it contains the follicles for your hair, as well as the sweat and sebaceous glands. Blood vessels and nerves on your skin are also in this layer.
Hypodermis/Subcutaneous: A layer of fat and connective tissue, it is essential for maintaining body heat, and also houses the larger blood vessels and nerves. Epidermis Dermis Hair also grows from follicles in your dermis. Hair is made up of keratin, and blood provides nutrients for it to grow. Hypodermis/
Subcutaneous Fun Facts The hypodermis/subcutaneous is one of the functions of your body that brings you warmth through insulation. It is a layer of tissue beneath your dermis, and carries most of the blood cells needed for the skin in blood vessels. These blood vessels carry life-giving blood into the capilliaries, the smallest veins in the human body, located in the dermis.
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