Nervous system

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Nervous system
2013-05-21 09:26:59
Psychology chp7 CNS PNS

Nervous system, central and peripheral nervous system.
Show Answers:

  1. What are the functions of the PNS?
    • To transmit sensory information from the body, organs and glands to the CNS
    • To send motor messages from the spinal cord to appropriate body parts via motor neurons
  2. What is the CNS?
    • Consists of the brain and the spinal cord
    • It receives and processes sensory information from internal and external environment and coordinates a response.
    • Conveys messages to the body and vice versa through the PNS
  3. What are the functions of the spinal cord?
    • Receives sensory information from the PNS and transmits it to the brain
    • Transmits motor messages from the brain to the PNS
  4. Describe the Somatic nervous system
    • Controls voluntary movement via control of skeletal muscles
    • Transmits sensory information inwards towards the spinal cord
    • Transmits motor messages outwards from the spinal cord to appropriate body parts
  5. Describe the Autonomic nervous system
    • Regulates internal bodily functions
    • Controls involuntary activity of internal, muscles and organs
  6. What is the role of the sympathetic nervous system?
    • Automatically arouses and energises the body during times of stress or need for increased physical activity
    • Triggers fight-flight response
  7. What is the role of the parasympathetic nervous system?
    • Calms the body and returns internal systems to calm levels of activity when stress or the need for physical activity disappears
    • Responsible for maintaining the stability of normal bodily functioning (homeostasis)
  8. Responses due to the fight or flight response
    • High levels of adrenaline
    • Increased heart rate and blood pressure
    • Increased respiration rate
    • Sweating
    • Goosebumps
    • Inhibited digestion
    • Dilated pupils
    • Dry mouth
    • Relaxed bladder
  9. What is the fight of flight response?
    A state of arousal that prepares or mobilises the body to confront a situation (fight) or flee from the situation (flight)