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Chapter 4

Chapter 4. Body Organization and Homeostasis. The Organization of the Human Body Increases in Complexity from Cells to Organ Systems. Tissues form organs that often work together in organ systems Organ systems: Groups of organs that work together to perform a common function.

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Chapter 4

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  1. Chapter 4 • Body Organization and Homeostasis

  2. The Organization of the Human Body Increases in Complexity from Cells to Organ Systems • Tissues form organs that often work together in organ systems • Organ systems: Groups of organs that work together to perform a common function

  3. Homeostasis Maintains Relatively Constant Internal Environment • Homeostasis is maintained by negative feedback mechanisms • Example: The regulation of body temperature

  4. Homeostasis • A negative feedback mechanism receives information from a receptor that detects a change in the internal or external environment…

  5. Homeostasis • Then a control center such as the brain sends out a response and the effector carries out the response returning the system to homeostasis again

  6. Homeostasis • The thermostat for the body is located in the hypothalamus

  7. Homeostasis • Hyperthermia, abnormally elevated body temperature, and hypothermia, abnormally low body temperature, are both life-threatening conditions that result when this mechanism fails.

  8. Homeostasis is usually maintained by: • Positive feedback mechanisms • Neutral forces • Negative feedback mechanisms • Magic • Witch doctors

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