Integumentary System

What are the functions of the epidermis?

• Protection from infection and UV radiation

• Production of sweat and Vitamin D

• Regulation of body temperature and excretion of waste

• All of the above

Which layer of the epidermis is responsible for water-proofing?

• Stratum corneum

• Stratum lucidum

• Stratum granulosum

• Stratum spinosum

How do melanocytes protect the body?

• By producing sweat

• By absorbing harmful UV radiation

• By regulating body temperature

• By excreting waste through sweat

What are the characteristics of the dermis?

• Composed of dense irregular connective tissue

• Contains nerves, blood vessels, sweat glands, and hair follicles

• Forms lines of cleavage

• Control of movement

Why are lines of cleavage important for surgeons?

• They help in identifying skin cancer

• They indicate the direction of hair growth

• Cuts made along the lines heal more quickly with fewer scars

• They determine the thickness of the dermis

The hypodermis is composed of loose connective tissue, attaches the dermis to underlying organs, insulates and stores nutrients.

• True

• False

Sweat is made up of 99% water with trace amounts of

• Salts

• Vitamins

• Glucose

• Wastes

What are the characteristics of sebaceous (oil) glands?

• Lubricates skin and hair

• Kills bacteria

• More are found on the scalp and face

• All of the above

Select the functions of hair.

• Keeps in heat

• Alerts us to insects before they bite

• Protects the eyes

• Protects from the sun

How are nails formed?

• Nails form from the nail root

• Nails grow from the nail matrix

• The lunula causes nail growth

• The cuticle grows outward