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Integumentary System
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by PBworks 5 years, 8 months ago
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heh heh. More Notes.You have approximately 19 million skin cells on every square inch of your body.
Nerve cells in the skin make it sensitive to touch.
Skin is 12-15% of your body weight.
Every inch of human skin consists of 20 feet of blood vessels.
Skin is waterproof.
The outer surface of skin is made of dead cells.
House dust is mainly skin flakes.
If you laid out your skin on a flat surface it would cover about 2 square meters.
Skin weighs 2.5 kilograms.
Only fat-soluble substances can pass through the skin.
Your hair stands on end and you develop ‘goose bumps’ because there are tiny muscles attached to the hair follicles and the contract when you are cold or scared.
INTEGUMENTARY SYSTEM FUNCTIONS
Protection against infection and injury
Helps regulate body temperature
Removes waste products
Provides protection from Sun
Produces Vitamin D
COMPONETS OF THE INTEGUMENTARY SYSTEM
Skin
Hair
Nails
Glands
Skin is the largest organ of the body.
The Integumentary System
So what exactly is the integumentary system? It consists of the hair skin and nails which form a protective barrier against the elements and the sicknesses floating around in the air.
Parts that make up the system!
The Skin
The skin is made up of billions and billions of dead cells. These were once basal cells which were pushed of the "rug" on which the maker basal cells rest. As they move upward these cells die and begin to flatten into other cells and eventualy make themselves into squames which Become your Epidemis. Below the epidermis is the Dermis which has all the nerve endings, blood vessels, hair follicles, melancolytes, and a layer of fat. This layer also absorbs the vitamin D from the sun. You may be asking "What about all the other stuff in the dermis?" Well the only thing that we forgot would be the erector pili. That's the muscle that pushes your hair up when you get goosebumps!
The Hair
Hair is composed of a core and a "shell" of dead keratin cells which keep the fragile core from fraying and damaging. That is rather important seeing as how the damage has some rather annoying effects like split-ends, the early death of and mistreatment of hair. Also people who straighten their hair everyday with a hot straightener are more likely to have split ends and burned hair. Did you know that melancolytes are also under your hair follicles? Hair follicles are the hole type things that your hairs grow out of. The melancolytes there give your hair color. Those who are born with dark melanin get dark colored hair such as brown or black. Those born with light malanin in their hair get blonde hair. And sometimes people are born with reddish melanin, hence the word "redheads." As people get older the melancolytes stop working and the hair becomes grey and keratin- colored. Hey an interesting factoid is that after about 2-6 years a follicle will stop producing and that hair will stop growing! Did you know that you have hair all over your body except for the palms of your hands and the soles of your feet?  This is a http://www.emc.maricopa.edu/faculty/farabee/biobk/BioBookINTEGUSYS.html>website for lots of things in the system. It's got all about the follicles and things and basically everything.=)
WIP tambra and areli
Integumentary
Components of the integumentary system include: skin, hair, nails, and glands. The skin, also called the epithelial tissue procontains all the nerve endings, blood vessels,hair follicles, sweat glands, melancolytes,vides a covering for the entire body. Epithelial tissue also lines hollow internal organs. Epithelial cells come in many different shapes. On the surface and in the lining of the blood vessels, they’re like overlapping shields. In the digestive and respiratory systems, they’re like columns. In the glands, they’re like cubes. In the bladder, epithelial cells change shape as the bladder shrinks and stretches. Some epithelial tissue is very thin—only one cell thick! This makes it very easy for water, oxygen, nutrients, blood cells, and minerals to pass through.
The skin is the biggest and heaviest organ of your body. It measures up to 21 ½ square feet and weighs up to 9 pounds on an adult. The dermis contains blood vessels. Sweat glands, and hair roots. It also contains a fiber that makes skin supple and elastic. Your skin protects you and your organs. It also forms Vitamin D, senses responses, and regulates body temperature. It also grows faster than any other organ and it keeps renewing itself. The epidermis has several functions including protection against injury and infection, regulating body temperature, removing waste, and protecting internal organs from the Sun.
Skin is waterproof and every inch of skin consists of 20 feet of blood vessels. Nerve cells in the skin make it sensitive to touch. The outer surface of the skin is made out of dead skin cells. House dust is mainly skin flakes. Only fat soluble substances can pass though the skin. Your hairs stand on end and you develop “goosebumps” because there are tiny muscles attached to the hair follicles and they contract when you are cold or scared.
-- shelle & lesly 5th
http://humanbodysystems.pbwiki.com/f/skin-1.gif
Integumentary System
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