Download - Nerve Cells & Neurotransmission
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Nerve Cells & Neurotransmission
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The Brain:• Made up of millions
of nerve cells called neurons
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Neuron contains 3 Parts:
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Dendrites:• Receive message
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Axon• Transmits
messages from the cell body to other dendrites or body tissues (muscles)
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Cell Body • Directs all activities
of the neuron
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Neurotransmission• Transfer of a
message from the axon of 1 nerve cell to the dendrites of another.
• Does not have direct contact
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Neurotransmission
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Communication between nerve cells:
• Occurs through the release of chemical substances (neurotransmitters) into the space between the axon & dendrite (synapse)
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When Neurons communicate:
• A message (electrical impulse) travels down the axon to the synapse
• This triggers the release of neurotransmitters into the synapse
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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.
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Neurotransmitters
• Very specific• Like a lock & key• Reusable
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Myelin:• Fatty substance• Covers axons• Increases rate of
conduction (how fast the message travels)
• 120 meters/second verses 2 meters/second