integumentary system by: savannah nash, gatwech both, and zoe hixenbaugh
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Integumentary SystemBy: Savannah Nash, Gatwech
Both, and Zoe Hixenbaugh
Consists of the skin, the largest organ in the human body
protects the internal body from any injury or damage
Aids the body in elimination Helps store fat Produces vitamins and hormones Maintains homeostasis First line of defense Protection from ultraviolent radiation
General Overview
Integument means covering Has receptors that can detect:
Heat and cold Touch Pressure and pain
Consists of: Hair Nails Sweat glands Oil glands Blood vessels Lymph vessels Nerves Muscles
Skin
Outermost layer of the skin Contains five sub-layers (bottom to top)
Stratum basale-Sratum spinosum Stratum granulosum Stratum licidum Stratum corneum- Keratinocytes Melanocytes Langerhans cells Merkel Cells
Epidermis
Composed of three types of tissue Collagen Elastic tissue Reticular fibers
Layers Papillary-upper Reticular layers-lower
Papillary Reticular Where the sensory fibers are located
Dermis
Thickiest and innermost layer of the skin Composed mainly of adipocytes Acts as an energy reserve Distributed all over the body Missing on certain parts of the body Insulator Shock Adsorber
Hypodermis
In charge of cooling the skin by evaporation Two types of sweat glands
Eccrine Apocrine
Eccrine From the dermis layer Produce sweat/perspiration Mainly on the forehead, upper lip, pales of hands and soles of feet
Acropine Found in armpits, around nipples, and in groin Also in the dermis layer Do not function until after puberty
Sweat Glands
Found in the dermis layer Located all over the body, except palms and
soles Made of secrete sebum Prevents skin and hair from drying Attached to hair follicles
Oil Glands
Transport nutrients and oxygen to the skin Transport Vitamin C from the skin to the
body Remove waste Constrict or dilate depending on the
temperature Located in the dermis
Blood Vessels
Supply lymph to the tissue of skin to help fight off microbes
Located all throughout the body alongside arteries and veins Not found in central nervous system, bone marrow, teeth, and avascular tissue
Lymph Vessels
Skin Cancer-most common form of cancer in the U.S.
Psoriasis-common skin condition that cause irritation and redness
Alopecia- complete loss of hair from the head or body
Health Problems
In your life time you will shed about 40 pounds of skin.
Adults have over 20 square feet of skin.
In just one month, your body will have a whole new layer of skin.
Between 30,000 and 40,000 dead skin cells fall off your body in under a minute.
The average amount of head hair is 120,000.
Goose bumps are actually little pimples that help keep a a layer of warm air over our bodies.
Fun Facts
Thinnest skin is found on the eyelidWhen you absorb water, your skin swells.The skin releases about three gallons of sweat a day in hot weather.Your skin comes in contact with over 150 different chemicals a day.The reason our lips are red is because the skin there is so thin that our blood vessels show through.
http://www.drstandley.com/bodysystems_integumentary.shtml
https://sites.google.com/site/integumentarysystem305/skin/sweat-and-
http://dermatology.about.com/cs/skinanatomy/a/anatomy.htm
http://www.webmd.com/skin-problems-and-treatments/picture-of-the-skin
Sources
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