Nervouse system

• 2 sections of nervouse system

  central nervouse system and peripheral nervouse system
• 2 sections of the PNS

  autonomic, somatic
• autonomic nervouse system

  subconscious systems, controls involantary actions(parasympathetic and sympathetic)
• parasympathetic NS

  seeks to return body to normal levels of arousal - rest and digest

  pupils constrict, salavation, airways constrict
• SympatheticNS

  emergengy arousal systems that activates when danger is percived (fight or flight)

  pupils dialate, saliva inhibited, airways dialate
• Somatic nervouse system (and 2 types)

  sensory (to CNS), motor (from CNS)
• neurons

  basic building blocks of nerve system to transport info around the body
• what are neurons made of

  dendrite, soma, nucleouse, axon, mylon sheeth, axon terminal, synapse
• cell body

  produces all protines for dendrites, axons and synaptic terminals
• axons

  main conductor of a neuron, capable of conveying electrical signals long distances
• dendrites

  branch out and recieve signals from other nerve cells like antena
• what is the nervouse system

  produces and relays messages between brain, spinal cord and a network of neurons
• lable the steps of the reflex arc

  A) pair receptors stimulated

  B) sensory messges travel to spinal cord (sensory neurons)

  C) sensory messages sent to brain via sensory neurons

  D) motor messages travel from spinal cord to leg muscles

  E) muscles in leg contract, pulling foot up

  F) brain registers sensation, becomes aware of reflex

  
• lable the parts of the Nerbouse System

  A) Central NS

  B) Peripheral NS

  C) Spinal Cord

  D) Brain Stem

  E) Brain

  F) Autonomic NS

  G) Somatic NS: sensory (to CNS), motor (from CNS)

  H) Sympathetic NS

  I) Parasympathetic NS

  
• difference between Afferent and Efferent

  Afferent: accending tracts of pathways carry sensory to brain

  Efferent: decending tracts or pathways carry info from brain
• two magor functions of the spinal cord

  recive sensory info from body and sent to brain

  recive sensory info from brain and sent to relevant part of body (control muscles, glands and internal organs)
• spinal cord

  long thin bundle of nerve fibres that extend from the base of the brain to the lower back
• mylon sheeth

  wraps around certain nerve axons, insulates nerves, speeds up elecrical impulses
• synapse

  structure that permits neuron to pass on electrical or chemical signal
• neurotransmitters

  chemical substance relesed at end of nerve fibre by arrival of a nerve impulse and, by diffusing across synapse or junction, effects transfer of inpulse to another nerve/muscle fibre or some other structure.