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  1. 1. AP6
  2. 2. Sherwood pp. 2-14
  3. 3. FOCUS ON <ul><li>Organization of the human body (chemicals, cells, organs etc) </li></ul><ul><li>Homeostasis </li></ul><ul><li>Negative feedback </li></ul><ul><li>Functions of the organ systems </li></ul><ul><li>(Ignore the last 4 slides) </li></ul>
  4. 4. Organization of human body <ul><li>Chemicals </li></ul><ul><li>Cell </li></ul><ul><li>Tissue: similar structure and function </li></ul><ul><ul><li>E.g. connective, muscle, nerve, epithelial </li></ul></ul><ul><li>Organ: group of tissue organized for specific functions </li></ul><ul><li>Organ systems </li></ul><ul><li>Organism </li></ul>
  5. 6. Organ systems
  6. 9. Homeostasis <ul><li>E.g. when body gets cold, shivering generates heat. </li></ul><ul><li>Homeostasis: maintaining a relatively stable environment within the body </li></ul>
  7. 10. Some things that are balanced <ul><li>1. concentration of O2 and CO2: CO2 production must be balanced by CO2 removal </li></ul><ul><li>2. pH </li></ul><ul><li>3. Concentration of water, salt, other electrolytes </li></ul><ul><li>4. Temperature </li></ul><ul><li>5. Nutrients </li></ul>
  8. 11. Negative feedback <ul><li>E.g. rise in body temperature -> sweating -> cooling of body temp </li></ul><ul><li>Negative feedback: imp’t in maintaining homeostasis. </li></ul><ul><li>NF: A bodily response that opposes the change </li></ul>
  9. 12. Positive feedback <ul><li>E.g. oxytocin during childbirth </li></ul><ul><li>(don’t worry about this one too much) </li></ul>