structure & function of nervous system

• What is the main communication system in the human body?

  The nervous system
• What are the two major jobs of the nervous system?

  Collect information and control organs
• What are the two main subdivisions of the nervous system?

  • Central nervous system (CNS)
  • Peripheral nervous system (PNS)
• What does the CNS consist of?

  The brain and spinal cord
• What does the PNS include?

  ANS and SNS
• What are the two divisions of the ANS?

  Sympathetic and parasympathetic
• What are the roles of the divisions of the nervous system?

  • CNS: Processes information and controls body functions
  • PNS: Connects CNS to limbs and organs
  • ANS: Regulates involuntary functions
  • SNS: Controls voluntary movements
• What is the function of the brain?

  Center of conscious awareness and decision making
• What does the brain stem control?

  Basic functions like sleep and reflexes
• What connects the brain to the spinal cord?

  The brain stem
• What does the PNS do?

  Supports CNS by sending and receiving messages
• What is the role of neurons in the PNS?

  Transmit messages to and from the CNS
• Why is the ANS considered involuntary?

  It operates without conscious control
• What vital functions does the ANS coordinate?

  Breathing, heart rate, and digestion
• What are the two parts of the ANS?

  Sympathetic and parasympathetic divisions
• What does the SNS control?

  Voluntary movement of muscles
• What type of responses does the SNS control?

  Voluntary movements and reflex responses
• What sensory information does the SNS take in?

  Information from sensory organs like eyes
• What happens to Jane's heart rate when she sees a bear?

  • Heart rate increases
  • Breathing becomes faster
  • Body prepares for action
• Which part of Jane's nervous system decided to keep her still?

  The central nervous system
• What part of the brain is involved in Jane's decision to stay still?

  The brain's decision-making center
• What produces the increase in Jane's heart rate and breathing?

  The autonomic nervous system
• What directs Jane's muscles to run away?

  The somatic nervous system
• What sends the message that there is danger to Jane?

  The central nervous system
• What physiological response did Nikki experience during her frightening experience?

  Shaking and increased heart rate