Integument

When the arrector pili muscles contract ______.

"goose bumps" form on the skin

The pigment ___ comes from fruits and vegetables, and accumulates in stratum corneum and dermis

Carotene

T or F ? Hair is composed of collagen fibers.

False

T or F ? Nails may penetrate into the subcutaneous tissue.

False

functions of integumentary system

It provides protection from UV irradiation; It helps regulate body temperature; It is involved in the production of Vitamin D

Which of the following skin components provides protection against UV irradiation?

Melanin

Indicate whether each statement is true or false regarding functions of the integumentary system. Vitamin D production Protection Provide structural support to underlying bones Excretion Temperature regulation Metabolize keratin Sensation

True True False True True False True

The yellowish-orange skin color comes from ___

carotene

The most superficial layer of the skin is called the _____.

epidermis

The pigment __is found in red blood cells in the blood vessel

hemoglobin

The red skin color comes from ___

hemoglobin

Darker skin after sun tanning is the result of ______.

increased melanin production in the skin

The long extensions of melanocytes transfer melanin to adjacent epidermal cells via small, membrane-bound packets called melanosomes. Exposure to UV light ______.

increases the amount of melanin inside of stratified squamous epidermal cells

Small patches containing concentrated __are called freckles

melanin

The brown-black skin color results from the presence of ___

melanin

The most important pigment determine the skin color is ___

melanin

The pigment ___ accumulates in epidermis

melanin

The yellowish-tinged skin color in some Asians results from the presence of a different form of ___

melanin