29-2 The Skin

- The Skin is the largest organ of the Humman Body.

-The Skin has Three Main Layers:

Epidermis:	Corneal Layer (dead cells) Protects from microbes and dehydration Basal Layer (living cells) contains Melanocytes Protects body from Ultra-violet Radiation
Dermis:	Hair Follicles Sensory Nerve Cells Sweat Glands Blood Vessels Helps to regulate the Body Temperature
Subcutaneous Layer:	Fat Cells and Blood Vessels Insulates and Conserves Body Heat

Skin Disorders

Cause

Symptoms

Carcinoma	mutation of non-pigment producing cells	Red, Bleeding Wart
Malignant Melanoma	mutation of pigment producing melanocytes	Mole that changes shape or size
Acne	pores become clogged with oil and infected	-clogged pores form blackheads -infecteed pores become inflamed
Psoriasis	inherited disorder, skin is produced and shed rapidly	raised red patches and scaley, white skin