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Understanding the Integumentary System: Skin Structure, Functions, and Layers

The integumentary system is primarily represented by the skin, the largest organ in the human body. It serves several vital functions: protection against external harm, sensory perception, and waste elimination. The skin comprises three main layers: the epidermis, which includes dead, keratin-filled cells for UV protection; the dermis, containing sensory neurons, blood vessels, and glands; and a layer of fat cells for insulation. Additionally, hair and nails, made of proteins, protect the body and grow throughout life, while exocrine glands, such as sweat and oil glands, play essential roles in skin health.

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Understanding the Integumentary System: Skin Structure, Functions, and Layers

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  1. What you will do today . . . -Name the largest organ of the integumentary system -List the general functions of the skin -Describe the structure of the layers of the skin

  2. The Integumentary System Skin: The Largest Organ!

  3. What are the functions of the skin? 1. Protection 2. Contains sensory devices 3. Gets rid of waste material

  4. 1. Epidermis a. Composed of squamous epithelium b. Made mostly of dead cells c. Cells are filled with a protein called keratin d. Melanin to absorb UV radiation The layers of the skin

  5. The layers of the skin 2. Dermis a. Sensory neurons b. Blood Vessels c. Muscle fibers d. Hair follicles e. Glands

  6. The layers of skin 3. Layer of fat cells

  7. Nails and Hair 1. Protect the body 2. Grow throughout life 3. Made of proteins

  8. Glands 1. Exocrine glands a. Sweat b. Oil c. Release secretions through pores 2. Acne results from oil glands being clogged

  9. References • http://www.rogers.k12.ar.us/users/ehutches/SKIN.gif • http://content.answers.com/main/content/wp/en-commons/thumb/3/3d/300px-Skin.jpg • http://www.wiredtowinthemovie.com/images/hotspots/level03integumentary.jpg • http://library.thinkquest.org/3007/skin.jpeg

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