Integemantary System
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Epidermis
1st layer. The outer layer of cells. Filled with keratin and composed of dead cells. Acts as a water proof protective layer.
Dermis
2nd layer composed of living cells. THis includes sensory neurons, blood vessels, muscle fibres, hair follicles, and glands (including sweat and oil glands)
Hypodermics (subcutaneous)
3rd layer. Composed of fat cells. Functions as energy reserve, shock absorber and insulator
Functions of the skin
• Regulates body temperature • Prevents fluid loss • Rids body of waste (through sweat) • Protection
Apocrine glands
Develops in areas with list of hair. Starts around puberty. Only about 200 of these glands. Ex. Armpit
Eccrine glands
Covers the rest of the body. Open directly onto the surface of the skin. Ex. Palms, forehead, feet
Melanin
Brown pigment that occurs in the hair and skin. It is responsible for tanning of skin exposed to sunlight.
Why do concentrations of melanin vary in populations in different locations around the world? I.e. The equator vs. Northern countries
Near the equator people are closer to the sun, which means more melanin is being produced in the skin. Which in return acts as a protective barrier against the suns rays. This cause people in these areas to have a darker skin pigment.
Thick skin
Found in areas where skin comes in contact with different textures and objects. Ex. Hands and feet.
Thin skin
Just not tough enough Ex. Belly, chin, back honestly anywhere.
BONUS What layer of the skin does tattoo ink stay in?
THE DERMIS
How does the skin regulate body temperature?
• Sweating • Goosebumps • Shivering