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Nerve Cells & Neurotransmission

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Nerve Cells & Neurotransmission. The Brain :. Made up of millions of nerve cells called neurons. Neuron contains 3 Parts:. Dendrites:. Receive message. Axon. Transmits messages from the cell body to other dendrites or body tissues (muscles). Cell Body.

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Presentation Transcript
the brain
The Brain:
  • Made up of millions of nerve cells called neurons
dendrites
Dendrites:
  • Receive message
slide5
Axon
  • Transmits messages from the cell body to other dendrites or body tissues (muscles)
cell body
Cell Body
  • Directs all activities of the neuron
neurotransmission
Neurotransmission
  • Transfer of a message from the axon of 1 nerve cell to the dendrites of another.
  • Does not have direct contact
communication between nerve cells
Communication between nerve cells:
  • Occurs through the release of chemical substances (neurotransmitters) into the space between the axon & dendrite (synapse)
when neurons communicate
When Neurons communicate:
  • A message (electrical impulse) travels down the axon to the synapse
  • This triggers the release of neurotransmitters into the synapse
neurotransmitters chemical messengers
Neurotransmitters (chemical messengers)
  • Diffuse across the synapse
  • Bind to receptors
  • This stimulates (starts) or inhibits (stops) an electrical impulse in the receiving neuron’s dendrites.
neurotransmitters
Neurotransmitters
  • Very specific
  • Like a lock & key
  • Reusable
myelin
Myelin:
  • Fatty substance
  • Covers axons
  • Increases rate of conduction (how fast the message travels)
  • 120 meters/second verses 2 meters/second
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