1. Health Science I Anatomy & Physiology

2.  Composed of the skin, sweat and oil glands, hair, and nails.  Accounts of 7% of the body’s weight.  Major role is protection.  Varies in thickness.  Composed of 3 distinct layers.  Epidermis  Dermis  Subcutaneous/Hypodermis

4.  The outermost layer of the skin  Not considered your “true skin”  Water-repellent cells made of protein (kerationcytes) make up 90% of the epidermis  Oil (sebaceous) and sweat glands (suderiferous) as well as hair follicles lie in the epidermis  Contains the stratified squamous epithelium and it lacks blood vessels

5.  Contains the nerves, sweat glands, oil glands, and blood vessels  Considered your “true skin”  The dermis nourishes the epidermis.  The middle layer of skin

6.  Parts of the hair  Shaft  Root  Hair follicle

7.  Function is to protect the fingers and toes from injury.  Composed of keratin.  Consists of the nail bed, lunula, and the cuticle.

9.  Dehydration, protein loss, and infection  First degree burns-only the epidermis is damaged  Second degree burns-epidermis and upper dermis damaged. May include blisters  Third degree burns-full thickness. Not painful. Skin grafting is almost always necessary.