Nervous_system_II_Lect_5

Nervous_system_II_Lect_5 - GB 102 Lecture Schedule Dr. Katz...

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1 Dr. Katz Dr. Brey Musculoskeletal System Digestion Nutrition Circulation Immunity Respiration Excretion Dr. Gaugler GB 102 Lecture Schedule Resting Potential (Polarization) Figure 39-4a Page 748 Axon –70 mV Amplifier Plasma membrane Electrode placed inside the cell Electrode placed outside the cell -70 mV Resting Potential
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2 Resting State – Large amount of potential energy (electrochemical gradient) Na/K pump (K+ diffuses out) A few Na+ diffuse in What if Resting potential is upset ? Action Potential (Depolarization) Resting State -70mV Action potential +35 mV Voltage activated ion channels
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3 Resting Potential Threshold Depolarization Repolarization Hyperpolarization Depolarization K+ gates open Na+ gates open Na+ gates close Repolarization Repolarization Voltage activated K+ channels open
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4 Resting State Voltage active ion gates close Na/K pumps; and passive diffusion of K+ to outside
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Nervous_system_II_Lect_5 - GB 102 Lecture Schedule Dr. Katz...

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