Homeostasis

• what is homeostasis ?

  is the maintenance of a constant internal environment in order to maintain optimum conditions for enzyme and cellular function
• Give examples of conditions maintained by homeostasis in the body

  1. Blood glucose
  2. body temperature
  3. water levels
• what two types of responses are used in body control systems?

  nervous and chemical
• what 3 components do all control systems have ?


  receptors

  coordination centres

  effectors
• what is the functions of a receptor ?


  receptors detect changes in the environment
• what is the function of a coordination centre ?


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

  Effectors (muscles or glands ) bring about responses to stimuli
• what is the function of the nervous system ?


  allows the body to react to its surrounding and coordinate an appropriate response
• what sequence of events describes how the nervous system works ?


  stimulus - receptor - coordinator - effector - response
• what is a reflex action ?

  is an automatic and rapid response which does not involve any conscious input from the brain
• what are reflex actions important ?

  aid survival by preventing harm to the body
• what is the function of the cerebral cortex ?


  controls consciousness intelligence , memory and language