Fast Skin Facts Fast Skin Facts The average adult has 21 square feet of skin (2 sq The average adult has 21 square feet of skin (2 sq m) which weighs 7lb (3.2 kg) and has approximately m) which weighs 7lb (3.2 kg) and has approximately 300 million skin cells. 300 million skin cells. On average each square half inch of skin contains: On average each square half inch of skin contains: 10 hairs, 15 sebaceous glands, 100 sweat glands, 3.2 10 hairs, 15 sebaceous glands, 100 sweat glands, 3.2 feet (1m) of tiny blood vessels feet (1m) of tiny blood vessels Skin is thickest on the palms & soles (1.2mm to Skin is thickest on the palms & soles (1.2mm to 4.7mm) and thinnest on the lips and around the eyes. 4.7mm) and thinnest on the lips and around the eyes. Every skin cell on your body is shed and replaced Every skin cell on your body is shed and replaced about every 52-75 days but can be much quicker in about every 52-75 days but can be much quicker in some skin diseases such as psoriasis. some skin diseases such as psoriasis. An average of 40 kilos of skin is shed during a An average of 40 kilos of skin is shed during a lifetime lifetime
16
Embed
Fast Skin Facts The average adult has 21 square feet of skin (2 sq m) which weighs 7lb (3.2 kg) and has approximately 300 million skin cells. The average.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Fast Skin FactsFast Skin Facts
The average adult has 21 square feet of skin (2 sq m) The average adult has 21 square feet of skin (2 sq m) which weighs 7lb (3.2 kg) and has approximately 300 which weighs 7lb (3.2 kg) and has approximately 300 million skin cells. million skin cells.
On average each square half inch of skin contains: On average each square half inch of skin contains:
Skin is thickest on the palms & soles (1.2mm to Skin is thickest on the palms & soles (1.2mm to 4.7mm) and thinnest on the lips and around the eyes. 4.7mm) and thinnest on the lips and around the eyes.
Every skin cell on your body is shed and replaced Every skin cell on your body is shed and replaced about every 52-75 days but can be much quicker in about every 52-75 days but can be much quicker in some skin diseases such as psoriasis. some skin diseases such as psoriasis.
An average of 40 kilos of skin is shed during a lifetime An average of 40 kilos of skin is shed during a lifetime
Integumentary SystemIntegumentary System
Consists of Consists of skinskin hair hair glandsglands nailsnails
Largest organ of the Largest organ of the human body the human body the
Skin accounts for 16% Skin accounts for 16% of the bodies mass!of the bodies mass!
Calcium absorptionCalcium absorption For bonesFor bones For muscle For muscle
contractioncontraction
5.5. Excretion of Excretion of WastesWastes
sweatsweat
FunctionsFunctions
Subcutaneous(Hypodermis)
Dermis
Epidermis
Dermis
Skin Cross Section
Epiderm
is
The epidermis is divided into two layers, dead and living cells.
Dead
Living
Living cells of the epidermis replicate, Living cells of the epidermis replicate, pushing their way towards the surface.pushing their way towards the surface.
The cells flatten and the organelles The cells flatten and the organelles disintegrate.disintegrate.
Eventually the living cells of the Eventually the living cells of the inner epidermis become the dead, inner epidermis become the dead, tough, waterproof, and flexible tough, waterproof, and flexible outer layer.outer layer.
As the living cells replicate they As the living cells replicate they produce two proteins produce two proteins
KeratinKeratin: tough protective protein: tough protective protein
MelaninMelanin: pigment: pigment
Localized loss of melanocytes (the cells that produce melanin)
Differences in Differences in melanocyte density leads melanocyte density leads to variation in skin colorto variation in skin color