Skin Structure and Function

What percentage of total body weight does the skin make up?

• 10%

• 16%

• 20%

• 25%

squamous epithelial cells, which are found in the outermost layer of the skin, are in the:

• epidermis

• dermis

• hypodermis

• nervous system

The innermost layer of the skin, the hypodermis, is composed primarily of:

• squamous epithelial cells

• nerves and blood vessels

• fat and connective tissue

• skeletal muscle

Which of the following is a primary function of the integumentary system?

• Pumping blood

• Digesting food

• Regulating body temperature

• Filtering waste from blood

Which layer of the skin contains nerves and blood vessels?

• Epidermis

• Hypodermis

• Dermis

• Subcutaneous layer

What do keratinocytes produce that helps prevent water from easily seeping into and out of the body?

• Melanin

• Collagen

• Glycolipids

• Elastin

Melanocytes produce melanin in response to:

• sunlight

• estrogen

• stress

• sugar

What is the primary function of melanin in the skin?

• To regulate body temperature

• To provide structural support

• To detect pain and pressure

• To protect against UV radiation

An important regulator of calcium absorption and bone growth

• Vitamin D

• Vitamin A

• Vitamin E

• Vitamin C

What is produced in the skin when cholesterol precursors in keratinocytes are activated by UVB light?

• Vitamin A

• Vitamin C

• Vitamin D

• Vitamin E