Nervous + endocrine system

• Nervous + endocrine

  NS-

  • primary internal communication system
  • electrical and chemical signals
  • collects, processes + responds to information form the environment
  • co-ordinates the works of organs and cells
• Nervous + endocrine

  CNS-

  • brain and spinal cord
  • brain is the centre of conscious awareness
  • outer layer (cerebral cortex) is 3mm around the whole brain, like an orange peel, only in mammals
  • spinal cord- controls reflexes, passes messages from the brain to the connecting neurones, then the PNS
• Nervous + endocrine

  PNS- peripheral nervous system

  • transmits messages through neuron's to and from the CNS
  • automatic nervous system (ANS)- vital functions- breathing, sexual arousal, stress reactions - sympathetic (fight vs flight) or parasympathetic (rest and digest)
  • somatic nervous system (SNS)- muscle movements- receives info from sensory receptors - Motor cortex
• Nervous + endocrine-

  Glands + hormones-

  • works with the NS for vital functions
  • various glands produce hormones into the blood stream, that affect certain cells due to a specific receptors
  • most hormones affect many parts of the body, making them have powerful responses
• Nervous + endocrine-

  endocrine + ANS-

  • pituitary- master gland
  • pancreatic islets- insulin, metabolism
  • testes- testosterone = aggression + sex drive
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  • adrenaline- adrenal medulla (above kidneys), into the bloodstream, triggers physiological change + arousal - fight or flight
  • instant reaction- acute response
  • once the threat has gone the parasympathetic nervous system returns the body to normal- opposite to autonomic nervous system