Chapter 7:3 Integumentary System


outermost layer of the skin


aka corium or "true skin". Contains blood capillaries, nerve endings, sweat glands, hair follicles, and other structures.

Subcutaneous or hypodermis

innermost layer

What are papillae?

(what covers the dermis)
fits into ridges on the stratum germinativum of the epidermis

How do papillae provide a method of identification?

fingerprints and footprints (patter of the ridges is unique)

What is the proper name for sweat glands?

Sudoriferous glands

Name 3 substances found in perspiration

water, salt and some body waste (odorless)

What are the function of oil glands

produce sebum, prevent infections, make blackheads/pimples (keep skin and hair from becoming dry)

What is alopecia

baldness (permanent loss of hair on the scalp)

List 7 function of the skin

protection, sensory perception, body temp. regulation, storage, absorption, excretion, production

What happens when blood vessels dilate? How does this regulate temperature?

get larger, sweat

What happens when blood vessels constrict? How does this regulate temperature?

gets smaller, heat retained in the body


serves as a barrier to the suns ultraviolet rays and invasion of pathogens or germs. Holds moisture and prevents deeper tissues from drying out

Sensory perception

nerves in the skin help the body respond to pain, pressure, temperature (heat and cold) and touch sensation

Body Temperature

blood vessels in the skin help the body retain or lose heat.

when blood vessels dilate (get larger)

excess heat from the blood can escape through the skin (sweat)

when blood vessels constrict (get smaller)

the heat is retained in the body

sudoriferous glands

help cool the body through evaporation of perspiration


temporary storage of fat, glucose (sugar), water, vitamins, and salts.


fatty tissue in the subcutaneous fascia is a source of energy


certain substances can be absorbed through the skin

transdermal medication

medications placed on sticky patches ans applied to the skin


skin helps the body eliminate salt


the skin helps the body production of vitamin D by using ultraviolet rays from the dun to form a initial molecule of vitamin D that matures in the liver


reddish color of the skin that can be caused by burns or a congestion of blood in the vessel


yellow discoloration of the skin (liver or gallbladder disease)


bluish discoloration caused by insufficient 02


blisters or sacs full of fluid


firm raised areas on the skin


areas of dried pus and blood


sacs filled with pus

macules (freckles)

flat spots on the skin


itchy, elvated areas with an irregiular shape


deep loss of skin that may extend into dermis