Question

concept covered: the skin 1

1. what two layers compose the skin? where is each found?
2. list the characteristics of the epidermis.
3. list the characteristics of the dermis.
4. what is keratin?

Explanation:

1. The two layers of the skin are the epidermis (the outermost layer) and the dermis (below the epidermis).
2. The epidermis is avascular, composed of stratified squamous epithelium, has several layers (stratum basale, spinosum, granulosum, lucidum in thick skin, and corneum), and is responsible for protection and cell renewal.
3. The dermis contains blood vessels, nerves, hair follicles, sweat and oil glands, is thicker than the epidermis, and provides strength and elasticity.
4. Keratin is a fibrous structural protein that provides strength and protection to the skin, hair, and nails. It is produced by keratinocytes in the epidermis.

Answer:

1. The two layers are the epidermis (outer - most layer) and the dermis (below the epidermis).
2. Avascular, stratified squamous epithelium, multiple layers (stratum basale, spinosum, granulosum, lucidum in thick skin, corneum), cell - renewal and protection.
3. Contains blood vessels, nerves, hair follicles, sweat and oil glands; thicker than epidermis; provides strength and elasticity.
4. A fibrous structural protein providing strength and protection to skin, hair, and nails, produced by keratinocytes in the epidermis.