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Epidermis Structure and Functions

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Questions and Answers

What is the main function of the outer layer of dead cells produced during keratinization?

to undergo mitosis
to resist abrasion and form a permeability barrier (correct)
to produce keratin fibers
to produce melanin

What is the process by which new keratinocytes are produced in the stratum basale?

lamellar body formation
diffusion
mitosis (correct)
keratinization

What type of epithelium makes up the epidermis?

stratified cuboidal
stratified squamous (correct)
simple squamous
simple columnar

What is the function of melanocytes in the stratum basale?

to produce and contribute melanin (C) Signup and view all the answers

How do keratinocytes in the epidermis receive nutrients and excrete waste products?

by diffusion (B) Signup and view all the answers

What is the characteristic of the cells in the stratum spinosum?

spine-like appearance (B) Signup and view all the answers

What is the main function of melanin in the skin?

To absorb harmful UV radiation (C) Signup and view all the answers

What is the role of tyrosinase in melanin production?

To convert tyrosine to DOPA (C) Signup and view all the answers

What is the name of the layer of the epidermis where cells die and lose their nuclei and cellular contents?

Stratum Granulosum (A) Signup and view all the answers

What determines the size and distribution of melanosomes?

Genetic factors (C) Signup and view all the answers

What is the function of lipids in the Stratum Corneum?

To prevent water loss from the skin (D) Signup and view all the answers

What is the name of the process by which the most superficial cells of the Stratum Corneum are removed?

Sloughing (A) Signup and view all the answers