chapter40%20-%20neural%20signalling%20_1_.ppt%20online%20version

Chapter40%20-%20neural%20signalling%20_1_.ppt%20online%20version

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Neural Signaling Chapter 40 Neurons are specialized to receive stimuli and transmit electrical and chemical signals via nerve impulses or action potentials
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Response to Stimulus (Fig 40-1) (PNS) (CNS) (PNS)
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The neuron www.wiredtowinthe movie.com/mindtrip_xml.html
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Nerves and Ganglia (Fig 40-3) In the PNS : a nerve : a ganglion : In the CNS : tract/pathway: Nuclei :
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90% of cells in human CNS are glial cell types Astrocytes: Oligodendrocytes: Microglia : Ependymal cells:
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Membrane Potential Membrane potential; electrical energy difference between inside and outside of cell Membrane potentials of cells are determined primarily by 3 factors:
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Ion Diffusion For example: K + diffuses out of the cell down its chemical concentration gradient As K + diffuses out of the cell………
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Equilibrium Potential Applying negative charge to inside will prevent cations (K + ) from leaving This negative charge across membrane is equilibrium potential for K + (E K ; Nernst potential: - 75mV)
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Chapter40%20-%20neural%20signalling%20_1_.ppt%20online%20version

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