Transcript The Skin
Monday, January 11, 2010 • Warm –up question • Which muscle type is voluntary but may react involuntarily at times? Give an example when this would happen. Last day to turn in any late homework is Wednesday • Don’t forget… you get a behavior grade on your report card. This can either be a really good thing, or a really bad thing! • Question of the day gets handed in everyday, no late work will be accepted. In your interactive folder… • Key Notes from cells, tissues and organ systems plus any notes we took on this • Key notes from last week • Foldable • Muscle chart and slide drawings (Friday) • Any other information that will help you on the test • Remember, this folder counts as a test grade and may be used on the next test The Skin Obj. D.1.5.1, D.1.5.2 Page 328 After this lesson you can amaze your friends by knowing….. • The functions and the structures of the skin • Identifying habits that can help keep skin healthy Key Terms • • • • • • Epidermis Dermis Cancer Melanin Pore follicle What do you think your skin does? What is the largest organ in the human body? • The SKIN performs many functions – It covers and protects the body from injury, infections, and water loss – It helps regulate body temperature – Eliminates wastes – Gathers information about the environment – Produces vitamin D Center page of foldable The skin is a tough covering • • • • • Protects the body Maintains temperature Eliminates wastes Gathers information Produces Vitamin D Concept map Monday, January 11, 2010 • Read pages 328 -333 • Define Key Terms page 330 – Cornell style • Assessment questions page 333 ~ Write the questions • Both of these goes into your interactive folders Question Time! • 1. What is the most obvious function of the skin? • 2. How does skin regulate temperature? • 3. How is waste eliminated by the skin? • 4. What information can you gather from the environment through your skin? • 5. How does your skin help you to have healthy bones? The Skin The skin has 2 main layers 1. Epidermis 2. Dermis Epidermis is the top layer; the layer you can see It’s made of a layer of dead skin cells Produces melanin Interesting facts…. • Your Amazing Skin • One square centimeter of skin contains: • 100 perspiration glands • 3,000,000 cells • 3,000 sensory cells at the ends of nerve fibers • One yard of blood vessels • 15 sebaceous glands • Four yards of nerves • The Science of the Skin • Your skin is: • Your largest organ • A vital component of your immune system • A powerful eliminator of toxins • Epidermis • Skin cells: • • Renew and exfoliate every 24 to 40 days • Contain no direct blood supply or nerve endings • Dead skin carries away bacteria and germs • Irreplaceable Moisture Complex • Contains: • Oxygen • Nutrition (from moisture & oil glands) • Moisture (perspiration) with Water soluble vitamins • Oil (sebum) The Dermis • Inner layer of skin • Contains nerve and blood vessels • Contains sweat glands, hair, and oil glands • Sweat comes out of openings called pores • Hair grows out of openings called follicles Question time… • What is the epidermis made of? • How do these dead cells protect? • What is the advantage of having dead cells make up the outer layer of skin instead of living tissue? Caring for your skin • Eat a healthy diet • Keep skin clean • Limit sun exposure Cancer is a disease in which some cells in the body divide uncontrollably Sun exposure can cause the skin to become wrinkled and leathery! Complete assessment on page 333 • Page 337 Reviewing key terms, answer 1 - 10