the division of the nervous system

• What is the human nervous system primarily composed of?

  Nerve cells
• What is the main function of the nervous system?

  To help all parts of the body communicate
• What percentage of the body's weight does the brain make up?

  About 2%
• What does the brain oversee in the body?

  The workings of the body
• What does the term "co-ordination" refer to in the context of the nervous system?

  The ability to respond to the environment
• What are the two main parts of the human nervous system?

  • Central nervous system (CNS)
  • Peripheral nervous system (PNS)

  
• What are the two main functions of the Central Nervous System (CNS)?

  Control of behaviour and regulation of processes
• What does the spinal cord connect?

  The brain and the rest of the body
• What is the role of spinal nerves?

  To connect the spinal cord to the body
• What happens if the spinal cord is damaged?

  Areas below the damage stop functioning
• What are the four main areas of the brain?

  • Cerebrum
  • Cerebellum
  • Diencephalon
  • Brain stem

  
• What is the function of the cerebrum?

  Involved in thought and speech production
• What is the role of the cerebellum?

  Controls motor skills and balance
• What does the thalamus do?

  Acts as a relay station for nerve impulses
• What are the functions of the hypothalamus?

  Regulates temperature, hunger, and thirst
• What does the brain stem regulate?

  Automatic functions essential for life
• What are the two components of the peripheral nervous system?

  • Somatic nervous system
  • Autonomic nervous system (ANS)

  
• What is the function of the somatic nervous system?

  Controls voluntary movements and reflexes
• What does the autonomic nervous system regulate?

  Involuntary actions and survival responses

  
• What neurotransmitter is primarily used by the sympathetic nervous system?

  Noradrenaline
• What is the role of the parasympathetic nervous system?

  Slows heartbeat and reduces blood pressure
• How do the sympathetic and parasympathetic nervous systems work together?

  • SNS prepares body for emergencies
  • PNS relaxes body after emergencies
  • Both regulate the same organs with opposite effects
• What happens to the body during a "fight or flight" response?

  Heart rate increases and blood vessels dilate

  
• What occurs after an emergency situation has passed?

  The parasympathetic system restores normal functions
• Describe the sequence of events after escaping a dog chase.

  • SNS activates during the chase
  • Body prepares for rapid action
  • PNS relaxes body after reaching safety
  • Normal functions resume, like digestion