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Lesson 3.2

Chapter 3: Membranes and the Integumentary System. Lesson 3.2. The Integumentary System. The Integumentary System. functions of the integumentary system anatomy of the skin appendages of the skin . Functions of the Integumentary System. protects against abrasion chemical damage

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Lesson 3.2

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  1. Chapter 3: Membranes and the Integumentary System Lesson 3.2 The Integumentary System

  2. The Integumentary System • functions of the integumentary system • anatomy of the skin • appendages of the skin

  3. Functions of the Integumentary System • protects against • abrasion • chemical damage • drying out • UV radiation damage • regulates body temperature

  4. Functions of the Integumentary System

  5. Anatomy of the Skin • epidermis • dermis • hypodermis

  6. Layers of the Epidermis

  7. Epidermal Cells • keratinocytes • produce keratin, form layers of epidermis • epidermal dendritic cells (Langerhans cells) • ward off infections • Merkel cells • touch receptors • Melanocytes • produce melanin

  8. Dermis • dense irregular fibrous connective tissue • papillary layer • forms fingerprints • reticular layer

  9. Hypodermis • fibrous connective tissue • adipose tissue • padding • insulation • energy storage

  10. Appendages of the Skin • sudoriferous (sweat) glands • eccrine • apocrine • sebaceous glands • hair • nails

  11. Review Questions

  12. The two layers of the dermis are the ______________ layer and the reticular layer.

  13. The outermost layer of the epidermis is the _____________.

  14. The ________________ layer of the epidermis contains melanocytes.

  15. Beginning at the stratum basale and moving up the next layer of the epidermis is the ____. A. stratum spinosum B. stratum granulosum C. stratum lucidum D. stratum corneum

  16. Which of the following produce a pigment that acts as sunscreen? A. Merkel cells B. epidermal dendritic cells C. keratinocytes D. melanocytes

  17. The fingerprints are derived from patterns in the ____. A. reticular layer B. papillary layer C. hypodermal layer D. melanin layer

  18. The ____ is found only on the palms, soles, fingers and toes. A. stratum corneum B. stratum lucidum C. stratum granulosum D. stratum basale

  19. Merkel cells function as ____. A. sweat glands B. infection preventers C. touch receptors D. sunscreen

  20. Chapter 3: Membranes and the Integumentary System Lesson 3.3 Injuries and Disorders of the Skin

  21. Injuries and Disorders of the Skin • injuries of the skin • infections of the skin and membranes • inflammatory conditions of the skin and membranes • cancers of the skin

  22. Injuries of the Skin • decubitus ulcers • bedsores • caused by restricted blood supply • burns • first-, second- or third-degree • caused by heat, chemicals, electricity or UV radiation • rule of nines Suzanne Tucker/Shutterstock.com, JTeffects/Shutterstock.com, Naiyyer/Shutterstock.com

  23. Rule of Nines

  24. Infections of the Skin and Membranes • viral infections • herpes varicella • herpes zoster • herpes simplex virus type 1 or type 2 • human papillomavirus • warts Maksym Bondarchuk/Shutterstock.com

  25. Infections of the Skin and Membranes • fungal infections (tinea) • athlete’s foot • jock itch • ringworm • toenail fungus • bacterial infections • impetigo • cellulitis

  26. Inflammatory Condition of the Skin • psoriasis • involves redness and irritation Kenxro/Shutterstock.com

  27. Cancers of the Skin • basal cell carcinoma • squamous cell carcinoma • malignant melanoma • ABCD rule Librakv/Shutterstock.com

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