Chp 6 Quiz 3

Melanocytes synthesize melanin, which protects underlying cells from the effects of ultraviolet light.

• True

• False

What separates the epidermis from the dermis?

• Subcutaneous layer

• Adipose tissue

• Stratum granulosum

• Basement membrane

What is the cause of cyanosis?

• Low blood oxygen levels

• Excessive exposure to ultraviolet (UV) radiation

• Excess of carotene in the diet

• A buildup of cyanide in the skin

What are dermal papillae?

• Bundles of dense connective tissue fibers.

• Site where nails are anchored to fingers or toes.

• Cluster of cells that produce hair.

• Projections of dermal tissue between epidermal ridges.

Why does exposure to ultraviolet light darken the skin?

• It stimulates the production of keratinocytes.

• It stimulates the synthesis of melanin.

• It stimulates proliferation of papillae.

• It stimulates the synthesis of keratin.

Why does the elevated body temperature seen with a fever develop?

• Because the set point for body temperature is decreased.

• Because the hypothalamus stops monitoring body temperature.

• Because infection destroys the hypothalamus and, thus, the control center for body temperature.

• Because the set point for body temperature becomes elevated.

If the dermal papillae were completely flat, this would result in the fingerprints becoming even more prominent.

• True

• False

What epidermal layer consists of a single layer of columnar cells that undergo mitosis?

• Stratum basale

• Stratum granulosum

• Stratum corneum

• Stratum spinosum

Excessive collagen production during wound healing results in__________.

• more rapid healing

• blood clot formation

• redness and swelling in wound area

• scar formation

What are corns?

• Scaly areas on the scalp

• Growths emanating from the nails

• Areas of white skin pigmentation

• Keratinized conical masses