California Cosmetology Anatomy & Sciences Practice Questions

1. Which is the largest organ of the human body?

The skin is the largest organ by surface area and weight, with three main layers: epidermis, dermis, and subcutaneous.

2. Which layer of the epidermis contains the cells that produce new skin?

The stratum basale (basal layer) is the deepest epidermal layer where new keratinocytes are produced and where melanocytes reside.

3. The stratum lucidum is found on which part of the body?

The stratum lucidum is a clear, thin layer found only in the thick skin of the palms and soles.

4. Which cells produce the pigment that gives skin its color?

Melanocytes are located in the stratum basale and produce melanin, which determines skin color and helps shield deeper cells from UV light.

5. Which epidermal layer is the outermost and consists of dead, keratinized cells?

The stratum corneum is the outermost layer; its dead, flattened keratinocytes are what cosmetic exfoliation targets.

6. Which layer of skin contains most of the collagen, blood vessels, and hair follicles?

The dermis is the middle layer of skin and contains collagen, elastin, blood vessels, nerves, hair follicles, and sebaceous and sweat glands.

7. The subcutaneous layer is primarily composed of which tissue?

The subcutaneous (subcutis) layer is mostly adipose (fat) and connective tissue that cushions and insulates the body.

8. Under California law, a cosmetologist using a chemical exfoliant may legally act on which layer?

Licensee exfoliation is limited to the dead cells of the stratum corneum; removal of living layers is the practice of medicine.