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01.31 Thursday- 1 - Thursday January 31 st 2008 Central...

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Thursday, January 31 st , 2008 Central Nervous System Basic unit = neuron Electron firings = action potentials Different neurons are build for different jobs Resting Potential: Graded Potential: Action Potential: Neuron Firing Rules: 1. All or none action 2. Goes to end of axon, travels in real time 3. No firing backwards How Do Neurons Reset Themselves? - didn’t know until 1957 - needs to get K+ and Na+ back to resting potential - solution: Na+/K+ pump Parts of a Neuron: - Cell Body o Cell’s life support center - Dendrites o Receive messages from other cells - Axon o Passes messages away from cell body to other neurons, muscles, or glands. - Axon Hillock: o collects the transmission of signals o enough signals will trigger an AP - Myelin Sheath o fat cells wrapped around the axon o the reason that babies need fat o allows electric impulses to travel faster o Multiple Sclerosis: deterioration of myelin sheath - Nodes of Ranvier o Exposed parts of axon between myelin Types of Signals: 1. excitatory-
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