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bild2_3 - BILD 2: Multicellular Life LECTURE #3 [Website:

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BILD 2: Multicellular Life LECTURE #3 [Website: http://www.biology.ucsd.edu/classes/bild2.WI11.1] Instructor: Darwin K. Berg dberg@ucsd.edu
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Figure 48-7 Modeling a mammalian neuron Inner chamber Outer chamber –90 mV 140 m M 5 m M KCI KCI K + Cl Potassium channel (a) Membrane selectively permeable to K + (b) Membrane selectively permeable to Na + +62 mV 15 m M NaCI Cl 150 m M NaCI Na + Sodium channel E K = 62 mV ( log 5 m M 140 m M ) = –90 mV E Na = 62 mV ( log 150 m M 15 m M = +62 mV )
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Figure 48-9 Graded potentials and an action potential in a neuron +50 0 –50 –100 +50 0 –50 –100 +50 0 –50 –100 Time (msec) Time (msec) Time (msec) 0 1 2 3 4 5 0 1 2 3 4 5 01 234 56 Threshold Threshold Threshold Resting potential Resting potential Resting potential Hyperpolarizations Depolarizations Membrane potential (mV) Stimuli Stimuli Stronger depolarizing stimulus Action potential (a) Graded hyperpolarizations produced by two stimuli that increase membrane permeability to K + . The larger stimulus produces a larger hyperpolarization. (b) Graded depolarizations produced by two stimuli that increase membrane permeability to Na+.
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bild2_3 - BILD 2: Multicellular Life LECTURE #3 [Website:

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