Nervous system

• What must be kept constant in the body to prevent cell damage?

  Internal conditions
• Why is homeostasis important for cells?

  It ensures the right conditions for enzyme action
• What is homeostasis?

  Regulation of internal body conditions
• How does homeostasis respond to environmental changes?

  By maintaining a stable internal environment
• What are the two types of communication systems involved in homeostasis?

  Nervous and hormonal systems
• Which internal conditions need regulating for homeostasis?

  Body temperature, blood glucose, water content
• What do receptors do in the control systems?

  Detect changes in the environment
• What is the role of coordination centres?

  Process information and organize responses
• What are effectors in the control systems?

  Muscles or glands that respond
• What is a stimulus?

  A change in the environment
• What types of stimuli can be detected?

  Light, sound, touch, pressure, pain, chemicals
• What happens when a receptor detects a stimulus?

  It sends information to the coordination centre
• What is the function of effectors in the control system?

  Counteract changes to restore optimum levels
• What is a negative feedback mechanism?

  A mechanism that restores optimum levels
• What is the optimum level?

  The level that enables the body to work best
• What are the components of automatic control systems in homeostasis?

  • Receptors
  • Coordination centres (brain, spinal cord, pancreas)
  • Effectors (muscles or glands)