nerves

• components of the nervous system

  • CNS (brain and spinal cord )
  • Peripheral nervous system
• Peripheral nervous system

  • somatic +
  • autonomic
• labeled neuron 


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• Functions of neuroglia


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• stages of action potential

  • Depolarisation
  • repolarization

  
• altering the membrane potential

  • stimulation (membrane exposed to chemical that opens sodium channels) +
  • graded potential (spead of sodium ions inside plasma membrane produces a local current that depolarizes)
• afferent and efferent neurons 


  Afferent neurons are sensory +

  efferent neurons are motor neurons
• types of receptors

  • Noriceptors (pain) +
  • thermoreceptors (temp) +
  • Baroreceptors (changes in pressure ) +
  • proprioceptors (sense of position ) +
  • chemorecptors (changes in chemical concentration)
• tactile receptors in skin

  • free nerve endings (touch) +
  • root hair plexus (hair) +
  • Merkel cells (fine touch) +
  • tactile corpuscles (fine touch and pressure on lips and nipples) +
  • Lamellated corpuscles (high frequency vibrations) +
  • ruffini corpuscles (pressure and skin distrotion)