ChapTitleBig20 Introduction to Animal PhysiologyChapTitleSmallPRINCIPLES OF ANIMAL ORGANIZATION AND FUNCTION

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Animal body structures reflect their functions.

  • 20.1 Most animal bodies are organized in a hierarchy from cells to tissues, organs, and organ systems.
  • 20.2 Connective tissue provides support.
  • 20.3 Epithelial tissue covers most interior and exterior surfaces of the body.
  • 20.4 Muscle tissue enables movement.
  • 20.5 Nervous tissue transmits information.
  • 20.6 Each organ system performs special tasks.

Animals have an internal environment.

  • 20.7 Our bodies function best within a narrow range of internal conditions.
  • 20.8 Animals regulate their internal environment through homeostasis.

How does homeostasis work?

  • 20.9 Negative and positive feedback systems influence homeostasis.
  • 20.10 Temperature control is a component of homeostasis.
  • 20.11 This is how we do it: Why do we yawn?
  • 20.12 Animals must balance their water content within a narrow range.
  • 20.13 In humans, the kidneys regulate water balance.

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