integumentary system ch. 5 part 2. skin physiology vitamin d deficiency – skin needs uv rays to...

Integumentary System Ch. 5 Part 2

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Integumentary System

Ch. 5 Part 2

Skin Physiology

• Vitamin D Deficiency– Skin needs UV rays to initiate production of

vitamin D– Vitamin D is turned into calcitrol which helps in

absorption of calcium in intestines– Lack of vitamin D – leads to rickets or

osteomalacia

Skin Physiology

• Regulates body temperature– Done with sweat glands (sudoriferous)– Water/salt comes to surface– As water evaporates, heat is taken away with the

water– Eccrine – function when hot– Apocrine – function during stressful times

Skin Physiology

• Oil Glands (sebaceous)– Released onto shaft of hair– Goes to surface of skin to:• Protect, lubricate, and waterproof skin

• Problem– Drainage becomes blocked – pimples– Production of sebum (oil) is controlled by sex

hormones

Skin Physiology

• Ceruminous (wax) glands– Secrete wax into ear canal– Functions:• Insect repellant• Keeps eardrum flexible

– Problem• Excess ear wax can interfere with hearing

Page 6: Integumentary System Ch. 5 Part 2. Skin Physiology Vitamin D Deficiency – Skin needs UV rays to initiate production of vitamin D – Vitamin D is turned

Hair

Page 7: Integumentary System Ch. 5 Part 2. Skin Physiology Vitamin D Deficiency – Skin needs UV rays to initiate production of vitamin D – Vitamin D is turned

Hair and Hormones

• Hisutism– Higher than normal levels of androgen (hormone)

cause excessive hair on lip, chin, chest, thighs, abdomen

• Male-pattern baldness– Androgen inhibits hair growth for genetically

predisposed males

Page 8: Integumentary System Ch. 5 Part 2. Skin Physiology Vitamin D Deficiency – Skin needs UV rays to initiate production of vitamin D – Vitamin D is turned

Skin Wound Healing

• Epidermal Wound Healing– near the surface (abrasion – scrape), 1st/2nd degree

burns– Detached, basal cells migrate till they meet each

other– Cell division fills in the space– No bleeding– Epidermal growth factor (EGF) – protein hormone

that stimulates growth of dermal cells and fibroblasts

Page 9: Integumentary System Ch. 5 Part 2. Skin Physiology Vitamin D Deficiency – Skin needs UV rays to initiate production of vitamin D – Vitamin D is turned

Epidermal Wound Healing

Page 10: Integumentary System Ch. 5 Part 2. Skin Physiology Vitamin D Deficiency – Skin needs UV rays to initiate production of vitamin D – Vitamin D is turned

Skin Wound Healing

• Dermal (deep) Wound Healing• 4 phases– Inflammatory phase– Migratory phase– Proliferative phase– Maturation phase

• Scar formation

Page 11: Integumentary System Ch. 5 Part 2. Skin Physiology Vitamin D Deficiency – Skin needs UV rays to initiate production of vitamin D – Vitamin D is turned

DWH - Phases

• Inflammatory– clot forms (platelets)– WBC arrive for defense

• Migratory– clot becomes a scab by fibroblast production– Epithelial cells begin to regrow

Page 12: Integumentary System Ch. 5 Part 2. Skin Physiology Vitamin D Deficiency – Skin needs UV rays to initiate production of vitamin D – Vitamin D is turned

DWH - Phases

• Proliferative– Epithelial cells grow beneath scab– Collagen fibers deposited– Tissue is reformed

• Maturation– Sloughing off of scab– Collagen fibers organize

Page 13: Integumentary System Ch. 5 Part 2. Skin Physiology Vitamin D Deficiency – Skin needs UV rays to initiate production of vitamin D – Vitamin D is turned

DWH – What would I see between these 2 phases?

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