Lesson 9 Notes
Nerve Impulse Transmission
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Electrical Potential
o
Inside of cell is more negative than outside
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Stimulation causes electrical charges
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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
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-70mV for resting potential
Disruptions to the Resting Potential
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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
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In Class
Sequence During Impulse
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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
