Lecture 27 Notes

Lecture 27 Notes - Bio 93 Fall 2009 Lecture 26 Nervous...

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Bio 93 Fall 2009 Lecture 26 Nervous System II Wednesday 12/2/09 Chapter 48, pages 1056-1061 Chapter 49, pages 1078-1084
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What happens when a neuron's membrane depolarizes? The neuron's membrane voltage becomes more positive
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Structure of a neuron Information is transmitted at the synapse
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Synaptic terminals on the cell body of a postsynaptic neuron
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Chemical Synapse: Arrival of action potential at synaptic terminal depolarizes membrane, opening voltage-gated channels that allow Ca 2+ to diffuse into the terminal. This triggers vesicles to fuse with membrane and release neurotransmitter
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Chemical Synapse: The neurotransmitter diffuses across the synaptic cleft, binds to ligand-gated ion channels in the post-synaptic membrane, opening the channels
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Main Points Neurons talk to each other at chemical synapses using neurotransmitters . Neurotransmitters can be excitatory and inhibitory Opening of ligand-gated ion channels by neurotransmitters results in a POSTSYNAPTIC POTENTIAL. A change in the membrane potential of
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Lecture 27 Notes - Bio 93 Fall 2009 Lecture 26 Nervous...

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