Homeostasis

• What is the function of the nervous system?

  It enables organisms to react to their environment and coordinates behaviour
• What are the two parts of the central nervous system?

  The brain and the spinal cord
• Why are reflex actions rapid and automatic?

  Because they do not involve the conscious part of the brain
• Why are reflex actions important?

  They're important for survival and to prevent damage to the body
• Give the pathway of a nervous response?

  Stimulus > receptor > coordinator > effector > response
• What is a stimulus?

  It is a change in the internal or external environment
• What is a synapse?

  It is the junction between two neurones where chemicals are released, allowing impulses to cross
• What is the function of neurones?

  To carry electrical impulses around the body
• What is homeostasis?

  It is the maintenance of a constant internal environment
• Why is homeostasis important?

  Because it maintains optimal conditions for a cell and organ function, and enzyme activity
• Give three internal conditions controlled in homeostasis.

  Body temperature,

  blood glucose concentration,

  water levels.
• Give three things all control systems include.

  Receptors,

  coordination centres,

  effectors
• Name three coordination centres.

  The brain,

  the spinal cord,

  the pancreas.
• Name two types of effectors.

  Muscles,

  glands