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Get your body system books!!. Integumentary System. the WHAT?. That stuff! Your SKIN!. Review Time!. Structure = a part of the body Function = a job to do Homeostasis = balance in the body Stimulus = something the body senses Response = how the body reacts to the stimulus.

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integumentary system
Integumentary System

the WHAT?

That stuff! Your SKIN!

review time
Review Time!
  • Structure = a part of the body
  • Function = a job to do
  • Homeostasis = balance in the body
  • Stimulus = something the body senses
  • Response = how the body reacts to the stimulus

…yeah…can’t wait for the DISORDERS, too

1 integumentary system overview
(your skin grows as you do…and if

you become dramatically smaller,

you’ll be left with your full-sized


#1 Integumentary System Overview

Do you ever think of your skin as an organ? Probably

not very often, if ever.

But it IS an organ, and one of

your largest! Take your skin off,

and you’d weigh 5 to 10 pounds less,

but more importantly, you wouldn’t

last very long.

2 integ sys overview contd
#2 Integ. Sys. Overview, contd.

Your skin has a BRUTAL job. It’s your only major organ

on the OUTSIDE of your body, so it has to deal with

conditions that would totally overwhelm your heart or

kidneys or any other organ. Because of this constant

attack, your skin cells die & are replaced every month!

Your integumentary system is any surface covering for

the body. We’ll focus on the major ones (skin, hair, nails).

Technically, your integumentary system also deals with

the tissues that line the inside of your organs—like the

lining of your throat down your esophagus, and so forth.

But we’ll focus on your outside skin this year.

Let’s see what your skin does for ya…

3 functions of the integumentary system
#3 FUNCTIONS of the Integumentary System

1. protection from environment & germs

2. regulates body temperature

3. excretes (gets rid of) wastes in sweat

4. has nerves to sense environment

5. produces vitamin D in sunlight


(vitamin D is vital in helping

your bones absorb calcium)

4 functions contd
#4 Functions, contd.

Those are some very important functions, eh?

Now, let’s see the structures that make all these functions

happen. There’s a lot—be warned!

5 structures of the integumentary system


#5 STRUCTURES of the Integumentary System

Your skin is the largest organ of the body. It has a lot of

important jobs, which we just saw, and is made of two main


  • epidermis – this is the thin outer layer of constantly
  • replaced dead cells.
  • The epidermis is
  • the body’s barrier
  • to the outside world.
  • dermis – this is the
  • thicker inner layer
  • containing the
  • following structures:
6 structures in the dermis
#6 Structures in the Dermis

i. sweat gland –excretes waste

& cools body

ii. sebaceous (oil) gland.

you need SOME oil on

your skin to keep it healthy.

iii. hair follicles which poke up

out of the surface of the skin

iv. blood vessels including small

arteries, veins & capillaries

(are you writing these structures in

the blanks on the back of your page?)

7 structures in the dermis contd
#7 Structures in the Dermis, contd.

v. muscles – tighten skin & raise

hairs (to get warmer)

vi. fat – we all have a layer of

fat (called the subcutaneous

layer) underneath our dermis

that insulates the body.

vii. nerves – send signals to the

brain, letting it know what

you’re touching or is touching

you. You can sense pain,

pressure, hot, and cold.

(I’ll have to draw nerves in the diagram)

8 structures contd
#8 Structures, contd.

Whew! Your skin is JAM-PACKED with all sorts of stuff.

You look at it from the outside, and it looks so plain and

simple. That’s on purpose. The outside has to deal with

all sorts of harsh conditions, so it’s all dead skin cells,

ready to flake off.

…and you know the result of all that flaking, right?


9 structures contd
Yeah, doesn’t hurt#9 Structures, contd.

Your hair and nails cover your body, too. Your nails are

made of a special skin-like protein called keratin, which

happens to be what your hair is made of, too.

Your hair and nails are made of special cells that are thick

and hardened. Why can you cut, chew, and chop them off?

They are dead tissues with no working nerves to signal pain.

10 disorders of the integumentary system
#10 DISORDERS of the Integumentary System

When we…


Skin Disorders!?!?

This could get nasty! I don’t…

Uh, sorry, Joe. This isn’t a democracy.

You lose. But we CAN spare you from

some of the more rare and gross skin disorders that affect

a few unlucky people. For now, get ready to hit the beach!

11 disorders contd
#11 Disorders, contd.

Joe likes the beach. Who doesn’t???

12 disorders contd
#12 Disorders, contd.

All that playing gets tiring, so Joe lays out on a towel for

a while.

…and he lays in the sun…

…and bakes in the sun…

…and roasts in the sun…

…and he finally gets up to go home.

He can tell he is BURNED to a near-crisp.

13 disorders contd
#13 Disorders, contd.

The next morning, it’s obvious to Joe what he’s done.

His friends joke with him the

whole day—making fun, slapping

his sore back, repeating “should’ve

put on your sunscreen” a billion


…and after a week of soreness

and peeling, Joe will be fine again.

But Joe better not fall into a

pattern of burn/heal/burn/heal

over his lifetime. All that sunlight

can really fill him with regrets

later on.

14 disorders contd
#14 Disorders, contd.

Your skin knows more than a lot of people’s brains—that

sunlight is RADIATION, and too much of it can be very


In the presence of the stimulus of sunlight, your skin responds

by making extra melanin – the pigment that gives your skin its

color. This helps bounce sunlight off your skin to prevent it

from absorbing too much radiation. This is how & why you tan.

But if you overwhelm your skin’s ability

to SLOWLY make melanin, it will absorb

a lot of energy, burn (temporary pain),

but most importantly, could set you up

for possible future problems.

15 disorders contd
#15 Disorders, contd.

Too many times of allowing your skin to be damaged by the

Sun can lead to a condition called melanoma. Melanoma is

a dangerous skin cancer that could be fatal if allowed to

spread to other organs. Protect yourself! Wear sunblock.

Don’t obsess over your tan. Watch

your freckles & moles for any

danger signs. Protect yourself!



16 disorders contd
#16 Disorders, contd.

What do these people have in common?

If you said that

their hair follicles

have fallen out,

then you’re right!

Forms of Male

Pattern Baldness

are known to

affect some women


17 disorders contd
#17 Disorders, contd.

Boy, the teenage years can be rough on the skin. Puberty

hits and pimple breakouts flare up. You experiment with

creams and medicated pads that you get at the store, but

what really works? Everyone’s different, so it’s really hard

to say, but if nothing seems to work, you might consider a

visit to the dermatologist.

Acne is really just bacteria-

infected hair follicles.

The bacteria love skin oil,

and when a sebaceous gland

clogs up, they’ll go crazy.

If it’s absolutely driving you

crazy, then go see the doc!

18 review
What would happen if your

Integumentary System stopped

working? Let’s review the

functions to see.

#18 Review
  • Protection from environment & germs
  • Joe would fry his organs in sunlight & germs & critters
  • would devour his body.
  • Regulates body temperature
    • Joe would have a VERY hard time cooling off while
    • exercising…he could actually overheat & hurt his brain.
  • Excretes (gets rid of) wastes in sweat
    • This wouldn’t be a huge deal…you have other ways of
    • getting rid of these wastes.
  • Has nerves to sense the environment
      • Joe would have no clue if he stood against a hot stove or sat on a
      • cactus. He’d be CONSTANTLY injuring his body.
  • Produces vitamin D using sunlight
    • Joe would need to get his vitamin D from milk or foods so that his
    • bones stayed strong.
19 review
#19 Review

How does the Integumentary System help maintain


  • When you’re hot, you sweat
  • When you’re cold, you get goosebumps
  • When you’re in sunlight, you protect yourself by tanning

Stimulus : Response

Bug crawling on you : nerves send signals, making you aware

It’s hot : sweating

It’s cold : goosebumps

Standing in sunlight : tanning