Differentiate among the roles of melanocytes and keratinocytes. Where in the skin are these cells located?
What will be an ideal response?
Melanocytes are located in the stratum basale of the epidermis. These cells produce a pigment, melanin, upon exposure to the sun. Melanin functions to protect the dermis from damage due to UV radiation. Keratinocytes form most of the cells of the epidermis; they produce a water-resistant, tough protein called keratin.
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Steroid hormones diffuse through cell membranes, then bind with receptors, whereas nonsteroid hormones bind receptors on the target cell membrane.
Answer the following statement true (T) or false (F)
Carbohydrates, proteins, and lipids are considered ________
A) major nutrients B) minerals C) vitamins D) coenzymes E) minor nutrients
Which cell type in the epidermis produces a pigment that absorbs ultraviolet light?
a. keratinocyte. b. melanocyte. c. langerhans cell. d. granstein cell. e. sebaceous cell.
Which of the following combining forms mean oil?
A. onych/o B. melan/o C. kerat/o D. seb/o