lecture 5 - Neuron can exist in 3 main states Resting state...

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Neuron can exist in 3 main states Resting state – neuron is polarized (inside of neuron is negatively charge relative to the outside), very tiny probe inside and outside and measure difference in charge (-70 millivolts) o Inside of cell is point of reference o -70 mV is the resting potential (no nerve impulse occurring at the time) Action potential (impulse) Repolarization Resting potential – relatively negative on inside, relatively positive on outside Special mechanism for moving ions across the membrane o Sopdium potassium pump o Require atp to work o Pump sodium ions into the cell pump potassium outside of side 3 sodium ions pumped out, 2 potassium ions pumped in o Facilitated diffusion – transport protein that doesn’t need anything except for concentration gradient of potassium ions More potassium ions leak out than sodium ions Inside axon are large negatively charged molecules but can’t leak out so stay there Some stimulus triggers a change in the charge triggers action potential Measuring difference in charge across the membrane starting with resting state - 55 mV is threshold and action potential can start and is unstoppable o Depolarization o Charge now becomes positive (inside) o +35 is peak o Repolarization as it approaches -70mV Ion channels o Voltage activated ion channels o
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lecture 5 - Neuron can exist in 3 main states Resting state...

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