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Home , Integumentary system

The Integumentary System (In teg yoo MEN tuh ree) , Tissues, and You The Integumentary system is the body’s outer covering. It has the task of physically separating the body from the external environment. This is the first key to .

Homeostasis: The internal stability or “steady state” maintained by your body. We maintain a body of 98.6ºF (37ºC)

The Integumentary system isn’t perfect. Cuts and other injuries break the barrier of the system and allow microorganisms to enter the body. Also, extensive exposure to the sun can cause damage to the . Other harmful agents can damage the system as well. http://academic.kellogg.edu/herbrandsonc/bio201_mckinley/f5-1_layers_of_the_inte_c.jpg The Skin and Tissue Tissues

Your body contains 250 different types of cells. Groups of similar cells with common function are called tissues. Tissues protect the body, connect body parts together, some lift and move the body, some transmit http://asweknowit.net/images_edu/dwa5%20tissues.jpg information. Epithelial Tissue

Epithelial tissue: sheets of closely packed cells that cover the entire surface of your body and form the lining of your internal organs, many different types all serve the general function of protecting the tissues and organs they cover

In your ,

1st type; line your windpipe and its major branches, cells secrete mucus which traps dust, pollen. etc. cilia sweep them up to throat to be swallowed,

2nd type; lines narrower airways cells have smooth surface allows air to flow quickly into the

3rd type; only one cell thick lines microscopic air sacs within lungs transfer of carbon dioxide and oxygen between blood and air you breath one cell thick to minimize distance gases have to travel Skin The largest and most familiar of the integumentary system and is only about 2 millimeters thick (the thickness of two CD’s)

The skin consists of three layers; : the outermost layer of skin is made up of dead epithelial cells that continually flake and fall off new cells pushing up from lower layers constantly replace those lost. Constant renewal is necessary because your skin would be scratched and damaged w/o it

Not all epidermis cells are dead; the bottom region of the epidermis contains living cells that produce melanin, a pigmented protein that gives skin color

: the skin layer that lies beneath and supports the epidermis is made up of fibrous , gives skin strength and elasticity. Also contains follicles, oil and sweat , muscles, , and blood vessels

Hypodermis: the deepest layer of skin, contains a kind of connective tissue called , includes storing cells and blood vessels http://pearsonsuccessnet.com/snpapp/iText/products/0-13-115075-8/text/chapter27/27images/27-09.gif Chemical Exchange With the Surroundings Hair and Nails

Hair and nails are part of the integumentary system

Hair covers almost all of your body and is composed of a protein called and is formed in pockets called hair follicles deep in the dermis layer

Follicle cells produce and deposit keratin at the base of each hair shaft, causing hair to grow

Fingernails and toenails are also made of keratin also grown as they are pushed outward by living cells beneath

Hair helps in homeostasis, protects head from harmful UV radiation, provides a layer of insulation from the changing outside

Eyebrows and eyelashes prevent dirt and http://iowagirl1997.files.wordpress.com/2009/03/ small particles from entering your eyes windowslivewritergetladygagaspokerfacebowhairstyle-a88dlady-gaga- bow-hair-pacificphotos211355-27724pcn-gaga-thumb.jpg Skin Care

Types of skin care have been used since 3000 B.C.E

In Egypt, Cleopatra said to have bathed in donkey’s milk to keep her skin smooth and supple

Active ingredients;

Alcohol: disinfecting and firming

Amino Acids: important building material for peptides and proteins, some have moisturizing properties others essential for formation of keratin

Biotin: vitamin H, has moisturizing and soothing properties which are intensified by citric acid, help with synthesis of keratin and improves brittle nails

Menthol: cooling, soothes itching, slightly disinfectant and stimulates micro-circulation

Salicylic Acid: found in willow bark, usually synthesized has anti-inflammatory and antibacterial properties. Often used for treatment

Witch Hazel: astringent and soothing properties, is mildly anti-inflammatory Skin Magnified

http://www.youtube.com/watch? v=XdKlmyfp5_w&feature=fvwrel http://www.essentialdayspa.com/ ingredients-cosmetics-c_23.htm

http:// www.chemistryexplained.com/Co-Di/ Cosmetic-Chemistry.html

http://www.emc.maricopa.edu/ faculty/farabee/biobk/ BioBookINTEGUSYS.html