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30 questions from the cosmetology theory practice test.
10 questions, graded as you go, with the reason for every answer. No sign-up.
Which layer of the epidermis is the outermost, made of flattened keratinized cells that are continually shed?
A. Stratum corneum
The stratum corneum, or horny layer, is the surface of the epidermis; its dead, keratin-filled cells are constantly shed and replaced. The stratum germinativum is at the opposite extreme, the deepest layer where new cells form.
Reference: Skin structure: layers of the epidermis
In which layer of the epidermis are new cells produced by mitosis?
B. Stratum germinativum
The stratum germinativum, or basal layer, is the deepest layer of the epidermis; its cells divide to replace those shed at the surface, and it also contains the melanocytes. The stratum corneum is made of dead cells that no longer divide.
Reference: Skin structure: layers of the epidermis
Collagen and elastin fibers, which give skin its strength and flexibility, are found mainly in which layer?
D. Dermis
The dermis, the 'true skin', is the supportive layer that holds the collagen and elastin fibers along with blood vessels, nerves and glands. The subcutaneous tissue below it is mostly fat that cushions and insulates.
Reference: Skin structure: the dermis