Chapter 7:3 Integumentary System

Epidermis

outermost layer of the skin

Dermis

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

Protection

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

Storage

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

Adipose

fatty tissue in the subcutaneous fascia is a source of energy

Aborption

certain substances can be absorbed through the skin

transdermal medication

medications placed on sticky patches ans applied to the skin

Excretion

skin helps the body eliminate salt

Production

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

erythema

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

jaundice

yellow discoloration of the skin (liver or gallbladder disease)

cyanosis

bluish discoloration caused by insufficient 02

vesicles

blisters or sacs full of fluid

papules

firm raised areas on the skin

crusts

areas of dried pus and blood

pustules

sacs filled with pus

macules (freckles)

flat spots on the skin

wheals

itchy, elvated areas with an irregiular shape

ulcer

deep loss of skin that may extend into dermis

...

...