Chapter 6 Wordbytes

1. Cut- = skin2. Derm- = skin3. Epi- = upon4. Follic- = small bag5. Hypo- = under/below6. Kerat- = horn7. Melan- = black8. Pil- = hair9. Seb- = grease10. Sub- = under

Unit 3

The Skinny of Skin: Integumentary System

Essential question: What is the purpose of the structures that

make up our "skin-deep beauty"?

InformationLearning Target: I will identify the basic parts of the integumentary system and explain the purpose of the Integumentary system Aim: What is skin made of and what is it good for?

InformationReal-World Connection: Your skin!

Vocabulary: integumentary system, epidermis, dermis, hypodermis, subcutaneous layer, pore, sweat gland, sebaceous (oil) gland, arrector pili, blood vessel, nerve, adipose tissue, hair follicle

Your skin!The skin is an organ system called

integumentary system

Facts:Makes up 16% of total body weightLargest organ system of body

Parts of skin systemParts of Integumentary System:1. Skin2. Hair3. Nails4. Sweat glands5. Oil glands

Functions of skinFunction of Skin:

1) Control body temperatureStructures in the Skin that do this Function

Sweat glandsExample of this Function

sweating

Functions of skinFunction of Skin:2) Protecting body from physical and chemical damageStructures in the Skin that do this Function

Dermis and epidermisExample of this Function

Skin being shield between outside world and internal organs

Functions of skinFunction of Skin:

3) Producing Vitamin D to make strong bonesStructures in the Skin that do this Function

epidermisExample of this Function Skin exposed to sunlight produces Vitamin D helps our blood absorb more calcium from our food

Functions of skinFunction of Skin:

4) Feel pain, pressure, and temperatureStructures in the Skin that do this Function

Nerve tissueExample of this Function

When you touch something, nerves of skin sense environment

Parts of skinThe skin is made

of three layers:1. Epidermis

a. Upper epidermisb. Lower epidermis

2. Dermis3. Hypodermis

(subcutaneous layer)

epidermisStructure:

Epidermis

Made up of

Living cells & dead cells

Function

Protect tissue and organs underneath from damage

Prefix/Suffix

Epi = uponDerm = skin

upper epidermisStructure:

Upper Epidermis

Made up of

Dead flattened skin cells; keratin

Function

protects the living cells underneath from bacteria, heat and chemicals.

Prefix/Suffix

Epi = uponDerm = skin(Upper epidermis = outer outer skin)

Lower epidermisStructure:

Lower Epidermis

Made up of

Living cells; melanin

Function

(1)To replace the dead cells in upper epidermis

(2)Protect skin from sun damage

Prefix/Suffix

Epi = uponDerm = skin(Lower epidermis = lower outer skin)

dermisStructure:

Dermis

Made up of

Collagen & elastic fibers

Function(1)Support epidermis(2)Hold organs like

blood vessels, nerves endings, hair follicles and oil and sweat glands.

Prefix/Suffix

Derm = skin

hypodermisStructure:

Hypodermis (subcutaneous layer)

Made up of

Adipose (fat) tissue

Function

Stores fat

Prefix/Suffix

Hypo = under, belowsub = underCut = skin

more parts: PORES

.Structure:

poresMade up Of

Tiny openings on top of skin with sweat & oil glandsFunction

Let sweat and oil come out of skin

Sweat gland

.Structure:

Sweat glandMade up Of

tubulesFunction

Cool surface of skin to decrease body temperature

Oil gland

.Structure:

Oil glandMade up Of

Fats & proteinsFunction

(1)Protect body against germs(2)Prevent hair and skin from drying

Arrector pili

.Structure:

Arrector piliMade up Of

Muscles attached to hairFunctionmakes the hair on a person’s arm stand up to keep them warmer

Blood vessel

.Structure:

Blood vesselsMade up Of

Arteries and veinsFunction

provide nutrients to the skin and help regulate body temperature

nerve

.Structure:

nerveMade up Of

Sensory receptorsFunction

Sense change and detect information about outside environment

Adipose tissue

.Structure:

Adipose tissueMade up Of

fatFunction(1) insulate the body from heat and cold (2) provides protective padding (3) an energy storage area

Hair follicle

.Structure:

Hair follicleMade up Of

hairFunction(1) regulating body temperature (2) providing protection from injury (3) increase sensation (4) produce hair