Lesson 9 Notes Nerve Impulse Transmission - Electrical Potential o Inside of cell is more negative than outside - Stimulation causes electrical charges - Membrane transport proteins o Ion channels Leakage: always open Gated: only open in response to stimulus o Sodium Potassium Pump The Sodium Potassium Pump - Active transport carrier that requires the energy of ATP - Simultaneously transports two potassium ions into the cell and 3 sodium ions out of the cell Establishment of the Resting Membrane Potential - -70mV for resting potential Disruptions to the Resting Potential - Graded Potentials o Depolarization (less negative) o Hyperpolarization (more negative) - Gated Channels o Chemically gated channels o Voltage gated channels - Action Potentials Membrane Potentials
Action Potential -
In Class Sequence During Impulse - Depolarization (less negative inside the cell): membrane potential is made more positive by the influx of Na+; makes neuron sensitive to neurotransmitter -
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- Fall '19