Sodium Potassium Pump/Action Potential

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8 Terms

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Resting Membrane Potential

Channels closed but pump open to maintain resting potential, -70 mV

<p>Channels closed but pump open to maintain resting potential, -70 mV</p>
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Depolarization

Na+ channel open and Na+ moves into cell, K+ channel closed, +40 mV, pump closed

<p>Na+ channel open and Na+ moves into cell, K+ channel closed, +40 mV, pump closed</p>
3
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Repolarization

K+ channel open and K+ moves out of cell, Na+ channel closed, -70 mV, pump closed

<p>K+ channel open and K+ moves out of cell, Na+ channel closed, -70 mV, pump closed</p>
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Hyperpolarization

K+ channel remains open and K+ continues to move out of cell, -75 mV, pump closed

<p>K+ channel remains open and K+ continues to move out of cell, -75 mV, pump closed</p>
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Types of ion channels

Mechanically gated, ligand gated, voltage gated, always open

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Myelination

Allows for multiple action potentials to “skip” across an axon, increases propagation

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Role of neurotransmitters

Carry signals between cells across the synapse

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How neurotransmitters are stopped

Neurotransmitter degradation, reuptake, or diffusion