Key parts

• Nervous system allows you to respond to changes in environment. It allows you to coordinate your actions
• Receptors detect stimuli and effectors bring about a response to stimulus

  Effectors include muscle cells and cells in glands
• Receptors communicate with effectors via nervous or endocrine system coordinate response
• The nervous system has two parts, central nervous system (CNS) and peripheral nervous system (PNS)
• 1. Nervous system
  2. 1 Central nervous system 2.2 Peripheral nervous system

  3.21 Autonomic nervous system 3.22 Somatic nervous system

  4.211 Sympathetic nervous system 4.222 Parasympathetic nervous system
• Central nervous system = brain and spinal cord
• Peripheral nervous system = neurons connecting CNS to rest of body
• Autonomic nervous system = Control unconscious activites
• Somatic nervous system = Controls conscious activities
• Sympathetic nervous system = Body ready for fight or flight
• Parasympathetic nervous system = Calms body down to rest and digest