5.1

• What is homeostasis?


  Homeostasis is the maintenance of a constant internal environment.
• Why is homeostasis important for cellular function?


  It maintains optimum conditions for enzyme and cellular function.
• What are examples of conditions maintained by homeostasis in the body?


  • Blood glucose concentration
  • Body temperature
  • Water levels
• What two types of responses are used in body control systems?


  Nervous and chemical responses are used.
• What are the three components of all control systems?


  • Receptors
  • Coordination centres
  • Effectors
• What is the function of a receptor in a control system?


  Receptors detect changes in the environment (stimuli).
• What is the function of a coordination centre?


  Coordination centres obtain and process information from receptors.
• What is the function of an effector?


  Effectors bring about responses to stimuli.