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Chapter 5: The Integumentary System PowerPoint Presentation
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Chapter 5: The Integumentary System

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Chapter 5: The Integumentary System - PowerPoint PPT Presentation

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Chapter 5: The Integumentary System
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  1. Chapter 5:The Integumentary System

  2. The Integumentary System • Composed of two parts • Skin • Associated structures

  3. Structure of the Skin • The skin consists of two layers • Epidermis • Dermis • Underneath and supporting the dermis is the subcutaneous layer.

  4. Structure of the Skin Epidermis

  5. Structure of the Skin Dermis

  6. Structure of the Skin Subcutaneous Layer

  7. Figure 5-1 Cross-section of the skin. How is the epidermis supplied with oxygen and nutrients? What tissue is located beneath the skin?

  8. Accessory Structures of the Skin • Help protect the skin and give it more functions • Include: • Sebaceous oil glands • Secrete sebum • Sudoriferous glands • Hair • Nails

  9. Accessory Structures of the Skin Glands

  10. Accessory Structures of the Skin Hair and Nails

  11. Figure 5-5 Nail structure.

  12. Functions of the Integumentary System • Four major functions: • Protection against infection • Protection against dehydration (drying) • Regulation of body temperature • Collection of sensory information

  13. Functions of the Integumentary System Protection Against Infection • Intact skin forms a primary barrier against invasion. • Interlocking pattern resists penetration. • Shedding removes pathogens. • Protects against bacterial toxins • Protects against some harmful environmental chemicals

  14. Functions of the Integumentary System Protection Against Dehydration • Skin prevents water loss by evaporation. • Keratin in the epidermis • Sebum release from the sebaceous glands

  15. Functions of the Integumentary System Regulation of Body Temperature • Loss of excess heat and protection from cold are important functions of the skin. • Constriction of blood vessels • Dilation of blood vessels • Evaporation of perspiration

  16. Functions of the Integumentary System Collection of Sensory Information • Skin has many nerve endings and other special receptors. • Free nerve endings • Touch receptors (Meissner corpuscle) • Deep pressure receptors (Pacinian corpuscle)

  17. Functions of the Integumentary System Other Activities of the Skin • Absorption of substances such as medications • Excretion • Water • Electrolytes • Wastes • Manufacture of vitamin D

  18. Color of the Skin • Factors that influence skin color include: • Melanin • Skins main pigment • Hemoglobin • Carries oxygen in RBC’s • Carotene • Skin pigment derived from carrots • Bile pigments

  19. Repair of the Integument Wound Healing • Occurs only in areas with actively dividing cells • Epithelial tissues • Connective tissues • Minimally in muscle and nervous tissue Factors That Affect Healing • Nutrition • Blood supply • Infection • Age

  20. Effects of Aging on the Integumentary System • Age-related changes in • Skin • Tissues • Pigment • Hair • Sweat glands • Circulation • Fingernails and toenails

  21. Care of the Skin • Proper nutrition • Adequate circulation • Regular cleansing • Removes dirt and dead skin • Sustains slightly acid environment to inhibit bacteria • Protection from sunlight • Exposure to UV light causes genetic mutations in skin that can lead to cancer, and causes premature aging.

  22. Word Anatomy