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Neuron Physiology. How do nerves transmit signals and communicate?. www.liv.ac.uk/ . Neurons. Selectively permeable to Na + and K + At rest, membrane is polarized ; K + inside cell, Na + outside cell. Sodium channels open and allow Na + to diffuse into the cell.

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neuron physiology

Neuron Physiology

How do nerves transmit signals and communicate?

www.liv.ac.uk/

neurons
Neurons
  • Selectively permeable to Na+ and K+
  • At rest, membrane is polarized; K+ inside cell, Na+ outside cell
slide5

Outside of cell

  • Potassium channels open allowing K+ to flow out of cell

Inside of cell

action potential
Action Potential
  • Action Potential = an electrical event occurring when a stimulus is applied allowing for Na+ into the neuron and reverse the polarity of the cell
  • Animation
action potential11
Action Potential
  • Localized event
  • Self-propagating
  • Moves in one direction

Impulse Animation

http://kvhs.nbed.nb.ca/gallant/biology/action_potential_propagation.jpg

slide12
Impulse travels down axon
  • Reaches terminal branches – synaptic knobs
slide13
Within synaptic knobs are synaptic vesicles
    • Contain neurotransmitters (ex: acetylcholine)
  • Synaptic vesicles fuse with membrane
  • Release contents into synaptic cleft
  • Animation
slide14
Neurotransmitters diffuse across the gap and attach to receptors on receiving neuron.
  • Permeability of membrane changes
  • Na+ diffuse into receiving cell
  • Impulse continues
  • Neurotransmitter removed or destroyed.
  • Transmission Across a Synapse Animation
neurotransmitters
Neurotransmitters
  • Acetylcholine = responsible for control of muscle tissue
  • Histamine = responsible for symptoms of allergic reactions
  • Dopamine = helps to provide feelings of enjoyment
  • Seratonin = helps to regulate mood
you tube videos 10 minutes
You Tube Videos (~10 minutes)
  • Anatomy of a nerve
  • Nerve Impulse
  • Action Potential Animation
  • Good overview: