What hurts if you pull it but doesnt

� What hurts if you pull it, but doesn't hurt if you cut it? �Your hair, of course! � Skin is elastic - it springs back into shape when stretched. � Some medicines (estrogen, nicotine) can pass through the skin, but others cannot (insulin). �Why is that? Because only fat-soluble substances can enter the skin, not water-soluble ones.

THE INTEGUMENTARY SYSTEM IS MADE UP OF 1. 2. 3. 4. 5. Skin Hair ____ Nails ____ Glands Sensory receptors _____ Parts of the Integumentary System

FUNCTIONS OF SKIN 1. 2. 3. 4. 5. Regulate body temperature ______ Protection Detects _______ sensations Excretes and _____ absorbs substances _____ Synthesizes vitamin D Structures of the integumentary system

LAYERS OF SKIN 1. 2. 3. Epidermis Dermis Subcutaneous layer (hypodermis) Layers of skin

EPIDERMIS � 5 layers Keratinized cells � ________ Avascular � _______ diffuse � Nutrients ______ from dermis Layers of the epidermis

� Keratin (protein) is deposited _____into cells � Cells become hardened _____and flattened as they _____ move up � ______ Water proofs and softens cells Keratinization of cells

1. 2. 3. 4. 5. Stratum basale (closest to the dermis) Stratum spinosum Stratum granulosum Stratum lucidum Stratum corneum (most superficial layer) Layers of the epidermis

� Go through ____ mitosis � Replace cells in superficial layers _________ die as they � Cells ______ are pushed towards the surface ____ Cells die and flatten

� Structures in cells lipids release _______ die � Cells ______

� 30 cells thick individual cells � No longer _____ � Cells are flattened and fill lipids with ______(binds) � A continuous _____ membrane � Cells closer to surface shed off _____ Stratum corneum sample (using tape)

1. 2. What enables the stratum corneum to act at a protective layer? How are layers of the epidermis able to remain alive without a blood supply?

NUMBER OF SKIN LAYERS � 6 or 7 �Thick vs Thin �Thicker in ________ high friction areas �Ex. ________ Fingers and toes The epidermis

DERMIS AND HYPODERMIS � Dermis �Dense fibrous connective tissue and elastic fibers �Collagen ________ Specialized structures �______ � Subcutaneous layer (hypodermis) Fat and blood vessels �__________

MELANIN �Provides color and UV protection _______ �Color ranges from yellow to black

HAIR � Dead Keratinized cells � Color produced by melanin _____ � Hair color and aging �Melanocytes are damaged or die _______

� Eccrine sweat gland �Regulate body temp �Release sweat in ________ response to emotion � Apocrine sweat glands �Do not function until puberty _____ puberty �Sweat is _____ odorless

� 3 pigments �Melanin Hemoglobin �______ Carotene �______ Sun Exposure: � Necessary to produce Vitamin D _____ � Increased exposure Darker skin �_____ �Increased risk of cancer _______

� Overgrowth of cells Size �_____ �Quantity _____ � DNA is damaged � Cell cycle malfunctions

Cyanotonic �Blood is not picking up enough oxygen �Skin turns ____ bluish-purple Erythmea Redness �______ of skin �Capillaries engorged blood with ____ �Heat, infection, inflammation, etc.

� Yellow skin and whites of the eyes bilirubin � Excess _____in blood liver disease � Indicates ____ in adults Immature liver � _______ function in infants

Adults Dependent on � _____ cause ______ � Usually meds Infants � Exposure to UV light Increases excretion � ______ of bilirubin

1. 2. 3. Which type of sweat gland helps maintain homeostasis? Who would have a greater risk of getting skin cancer, an African American Cal Trans employee or an African American baseball player? Why does the treatment for jaundice differ in adults and infants?

�Inked deposited into �____ dermis �Why? �Layer is _____ permanent �Inked cells are trapped https: //www. youtube. com/watch? v=DMu. Bif 1 m. Jz 0

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Elaine Davidson

1. 2. 3. Which trends are popular among your peers? What risks are involved with certain types of body augmentation? Should teens be allowed to augment their bodies? Why or why not?

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HTTP: //WWW. YOUTUBE. COM/WATCH? V=CNQ_UW 66 LFU Causes of burns: �______ Chemicals �______ Extreme heat �______ Electricity 1 st degree burns Redness �_______ 2 nd degree burns Redness and blistering �____________ �_______ 1 st two layers 3 rd degree burns All layers damaged �________ No pain �________

1 st and 2 nd Cool burn �_____ �Cover with gauze �Pain reliever 3 rd �Don’t cool Don’t remove clothing �_______ �______burnt part Elevate �Cover

� Needed when the stratum basale and _______ Stem cells are _____ destroyed. skin � Transfer of healthy _____ healthy skin to a donor site The process: Obtain donor skin � _______ Poke holes � _______ Attach to � _______ wound site � http: //www. youtube. com/watch? v=7 ZYrw 2 f Yk 8 U&oref=http%3 A%2 F%2 Fwww. youtube. co m%2 Fwatch%3 Fv%3 D 7 ZYrw 2 f. Yk 8 U&has_verifi ed=1

� Wrinkles during prolonged exposure Sebum is washed �____ away � Science of “winkley” hands Dead cells swell, living �_____ do not area to �Provide surface _____ grip objects

You attempt to re-warm a hypothermic patient using hot water and zip-lock bags. Your attempt was thwarted when you attempted to remove the zip-lock which had adhered to the skin. The skin in the affected areas was removed when you took the bag off. The bags were placed over the entire body except the head, neck and perineum. � What percentage of the body was burned? � Which degree burn did your patient suffer from?

A toddler spills a steaming cup-o-noodles over her the left side of her head and her left anterior torso. She develops blistering, redness and intense pain over the affected areas of her body. She later develops a fungal infection. a) What percentage of her body is burned? b) Which degree burn is she suffering from?

A boiler explodes and burns an unsuspecting victim who has walked by mid-blast. His entire body is burned with the exception of his perineum and right anterior thigh. � What percentage of his body is burned? � Which degree is burn is your patient suffering from?

A mechanic is working on a car. Gas is accidentally sprayed on his arm which then catches fire. He was wearing a jacket at the time of the accident, which ended up being burned into his skin. a) Would it be wise to attempt to remove the jacket from his body? Why or why not? b) What percentage of his body has been burned?

A young girl accidentally lit her sweater on fire while she was blowing out her birthday candles. The entire right side of arm is burned, she tells her mom that she is fine and does not feel any pain. Yet, her skin is charred and the hypodermis is visible. � What percentage of her body has been burned? � Which degree burn is your patient suffering from? � Why can’t your patient feel pain even though she has been burned?

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