Skin

Homeostasis

Stable internal operating conditions in the body.

Functions of the integument

Protection, temperature control, and sensory detection.

Layers of the skin

Epidermis and dermis.

Stratum Basale

Innermost layer of the epidermis; contains melanocytes which darken the skin and protect against UV rays.

Stratum Corneum

Outermost layer of the epidermis; consists of flattened dead cells containing keratin.

Dermis

Layer of skin mostly composed of connective tissue, containing collagen and elastin.

Functions of sweat glands

Produce fluid in response to stress, such as fright or overheating.

Functions of oil glands

Lubricate and soften the skin; reduce bacterial populations.

Functions of hair

Provides insulation and protection; the root is embedded in the dermis.

Arrector pili

Smooth muscles attached to erect hairs, causing goosebumps.

Basal cell carcinoma

Most common type of skin cancer in the U.S.

Squamous cell carcinoma

A type of skin cancer that arises from squamous cells.

Malignant melanoma

Accounts for almost ¾ of deaths due to skin cancer.

Primary cause of skin cancer

Excessive UV radiation exposure.

Why do we get wrinkles?

Loss of collagen, sun exposure, and smoking.