THE INTEGUMENTARY SYSTEM HOW DOES SKIN GROW 1

1. Deepest layer of the stratified squamous epithelium a) sight of mitosis b) nourished

1. Superficial layer of the stratified epidermis a) no means of nourishment b) keratinization

1) Same quantity in everyone 2) Amount of melanin produced is determined by genetics

Absorbs UV light to prevent DNA mutations * thymine dimers WHAT IS THE FUNCTION

1. Environmental factors that increase production a) sunlight b) tanning lamps OTHER INFLUENCES ON

2. Blood vessels a) well oxygenated, hemoglobin bright red – pinkish color skin b)

3. Diet a) yellow & orange vegetables – orange/yellow skin (B-carotene) OTHER INFLUENCES ON

4. Biochemical imbalances a) excessive bilirubin – yellowish skin OTHER INFLUENCES ON MELANOCYTES

1. Conical projections of the dermis 2. Unique to everyone a) genetics b) environmental

1. Makes the dermis tough and elastic a) collagen injections – b) collagen creams

INFLAMMATION Symptom Cause Redness Vasodilation, more blood in area Heat Large amount of blood

1. Epidermis: increasing rate of mitosis 2. Dermis: scabbing, fibroblasts forming new collagenous fibers,

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THE INTEGUMENTARY SYSTEM

HOW DOES SKIN GROW?

1. Deepest layer of the stratified squamous epithelium a) sight of mitosis b) nourished by blood vessels in the dermis c) process pushes the older cells layers upward towards the stratum corneum EPIDERMIS: STRATUM BASALE

1. Superficial layer of the stratified epidermis a) no means of nourishment b) keratinization EPIDERMIS: STRATUM CORNEUM

WHAT CONTROLS SKIN TONE?

1) Same quantity in everyone 2) Amount of melanin produced is determined by genetics EPIDERMIS: MELANOCYTES

Absorbs UV light to prevent DNA mutations * thymine dimers WHAT IS THE FUNCTION OF MELANOCYTES?

1. Environmental factors that increase production a) sunlight b) tanning lamps OTHER INFLUENCES ON MELANOCYTES

2. Blood vessels a) well oxygenated, hemoglobin bright red – pinkish color skin b) low oxygen levels, hemoglobin dark red – bluish color skin OTHER INFLUENCES ON MELANOCYTES

3. Diet a) yellow & orange vegetables – orange/yellow skin (B-carotene) OTHER INFLUENCES ON MELANOCYTES

4. Biochemical imbalances a) excessive bilirubin – yellowish skin OTHER INFLUENCES ON MELANOCYTES

WHAT CAUSES FINGERPRINTS AND WRINKLES?

1. Conical projections of the dermis 2. Unique to everyone a) genetics b) environmental FINGERPRINTS: DERMAL PAPILLAE

1. Makes the dermis tough and elastic a) collagen injections – b) collagen creams – WRINKLES: COLLAGENOUS & ELASTIC CONNECTIVE FIBERS

INFLAMMATION Symptom Cause Redness Vasodilation, more blood in area Heat Large amount of blood accumulating in area and as a by-product of increased metabolic activity in tissue Swelling Increased permeability of blood vessels, fluids leaving blood go into tissue spaces Pain Injury to neurons and increased pressure from edema HOW DOES THE SKIN HEAL ITSELF?

1. Epidermis: increasing rate of mitosis 2. Dermis: scabbing, fibroblasts forming new collagenous fibers, suturing of large breaks, possible scarring HOW DOES THE SKIN HEAL ITSELF?