science F3 1.1

• Definition of Human Nervous System

  The human nervous system is the control system in the human body
• The nervous system is divided into:

  • Central nervous system
  • Peripheral nervous system
• The Human Nervous System

  Central nervous system

  1. Spinal cord
  2. brain
• The Human Nervous System

  Peripheral nervous system

  Autonomic nervous system (controlling out of control actions)Somatic nervous

  system (controlling controlled actions)

  Spinal cord

  brain
• The Human Nervous System

  Peripheral nervous system

  Autonomic nervous system (controlling out of control actions)

  Somatic nervous system (controlling controlled actions)

  Spinal cord

  brain
• The pathway of the human nervous system:

  1. Stimuli
  2. Sensory Organs/receptors/affector
  3. Nerve impulses
  4. The brain
  5. Nerve impulses
  6. Effector
  7. Respond
• Voluntary action

  Actions that can be controlled by one’s will

  Example

  Communication

  Thinking

  Eating
• Involuntary actions

  Actions that occur automatically, that is are unnoticed and cannot be controlled according to one’s will

  Example

  Breathing

  Digestion

  • Eye reflex