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28.1 - Levels of Organization

  • determination - process when a stem cell becomes committed to develop into only one type of cell.
  • differentiation - process when committed cells acquire the structures and functions of highly specialized cells.
  • tissue - group of cells that work together to perform a similar function.
  • organ - group of different types of tissues that work together to perform a specific function or related functions.
  • organ system - two or more organs that work in a coordinated way to carry out similar functions.

28.2 - Mechanisms of Homeostasis

  • homeostasis - regulation and maintenance of constant internal conditions in an organism.
  • feedback - information that's compared with a set of ideal values and aids in maintaining homeostasis.
  • negative feedback - control system for homeostasis that adjusts the body's conditions when the conditions vary from the ideal.
  • positive feedback - control system in which sensory information causes the body to increase the rate of change away from homeostasis.

28.3 - Interactions Among Systems

  • thermoregulation - process of the body maintaining a stable internal temperature under various conditions.
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