Bio psych 1-15

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16 Terms

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  1. Resting Membrane Potential

Neurons maintain a resting membrane potential of approximately -65 to -70 mV.

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  1. K+ (Potassium)

More concentrated inside the neuron.

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  1. Na+ (Sodium)

More concentrated outside the neuron.

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  1. Cl- (Chloride)

More concentrated outside the neuron.

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  1. Sodium-Potassium Pump

Transports 3 Na+ out and 2 K+ into the neuron.

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  1. Selective Permeability

K+ channels allow K+ to move more freely than Na+.

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  1. Equilibrium Potential

The voltage where the net movement of a specific ion stops.

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  1. K+ Equilibrium Potential

Approximately -80 mV.

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  1. Na+ Equilibrium Potential

Approximately +62 mV.

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  1. Cl- Equilibrium Potential

Approximately -70 mV.

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  1. Astrocytes

Help regulate extracellular ion concentrations and prevent excessive neuronal excitation.

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  1. Resting Phase

The neuron is at approximately -70 mV.

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  1. Threshold

The membrane reaches approximately -55 mV, and Na+ begins entering.

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  1. Depolarization

Na+ channels open and Na+ rushes into the neuron.

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  1. Overshoot

The membrane potential peaks around +30

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