Ch. 4 Skin Structure and Growth

Which sentence best defines melanin?

• This fibrous, connective tissue is made from protein that gives the skin form and strength

• These tiny grains of pigment are produced by melanocytes in the stratum germinativum.

• This fatty or oily substance lubricates the skin and preserves hair's softness.

• This fibrous protein of cells is also the principal component of skin, hair, and nails.

Which response best describes a cause of wrinkles or sagging skin?

• the inability of sudoriferous glands to eliminate waste products from the skin

• the barrier function allows too much skin moisture to be lost by water evaporation

• collagen fibers lose their strength due to exposure to UV light

• the sebaceous glands secreting too little sebum due to emotional stress

Outermost and thinnest layer of the skin

• subcutaneous

• surface

• epidermis

• dermis

Water loss through perspiration is an example of which function of the skin?

• excretion

• secretion

• absorption

• protection

What gives the body smoothness and contour while providing a protective cushion for the skin?

• arrector pili muscles

• dermal papillae

• subcutaneous tissue

• keratin

A broad-spectrum sunscreen is one that _________.

• supplements the skin with vitamin D and other actives

• protects the skin in a wide range of weather conditions

• provides protection for all skin tones

• has been shown to protect against UVA and UVB radiation from the sun

What is the function of sebaceous glands?

• to secrete oil to lubricate the skin

• to excrete sweat to regulate body temperature and eliminate waste products

• to produce the skin pigment melanin

• to keep the skin moist by preventing water evaporation

What is the function of the sudoriferous glands?

• to produce the skin pigment melanin

• to keep the skin moist by preventing water evaporation

• to secrete oil to lubricate the skin

• to excrete sweat to regulate body temperature and eliminate waste products

All of the following are skin functions EXCEPT ______..

• absorption

• heat regulation

• sensation

• add necessary body weight to maintain good health

What is the function of elastin?

• It determines the depth and tone of an individual's skin, hair, and eye color

• It lubricates the skin and preserves hair's softness

• It gives the skin flexibility and elasticity

• It gives the skin form and strength