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chapter 6: integumentary system

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integumentary system

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chapter 6: integumentary system

  1. 1. Chapter 6 Integumentary System
  2. 2. Organ An organ consists of two or more types of tissues grouped together that perform a specialized task. Integumentary System Includes the skin plus accessory structures Skin is the largest organ in our body
  3. 3. Functions of skin include 1. Forms protective coating 2. Retards water loss 3. Vitamin D synthesis 4. Temperature control 5. Houses sensory receptors
  4. 4. The skin is composed of 2 layers 1. Epidermis 2. Dermis The subcutaneous layer (hypodermis) lies beneath the skin, but is not considered part of the skin.
  5. 5. Epidermis Outermost layer of skin Stratified squamous epithelium Outermost layers are keratinized No direct blood supply – Receives nutrients by diffusion
  6. 6. There are five (5) layers of the epidermis: Stratum corneum Stratum lucidum Stratum granulosum Stratum spinosum Stratum basale
  7. 7. Layers of the epidermis Stratum corneum Is the outermost layer of epidermis Composed of tightly packed dead cells Cells are keratinized Keratin = water insoluble protein Stratum basale Deepest layer of epidermis Cells are nourished by dermal blood vessels Site of cell growth and division Stratum Basal contains Melanocytes
  8. 8. Melanocytes Secrete melanin – pigment Number of melanocytes is similar in all people Darker skin from darker and larger melanin granules Albinism – mutation resulting in no melanin production
  9. 9. Figure 6.4a A melanocyte with melanin granules Figure 6.5 The red eyes and pale skin reflect the lack of melanin in albinism.
  10. 10. Dermis Deeper layer of skin Composed of dense irregular connective tissue Contains dermal papillae Blood vessels and nerves Hair follicles Sweat glands and Sebaceous glands
  11. 11. Figure 6.2 Section of skin
  12. 12. Sweat Glands - secrete sweat onto surface of the skin Eccrine glands – respond to elevated temperatures Apocrine glands - anxiety, sexual arousal, and pain Sebacous glands Associated with hair follicles Secretes Sebum – oil Keeps hair and skin soft and waterproof
  13. 13. Subcutaneous layer (often called hypodermis) Subcutaneous layer – not part of skin Comoposed of adipose tissue, areolar tissue, and blood vessels The subcutaneous layer binds skin to underlying organs Adipose insulates the body
  14. 14. End of Chapter 6

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