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- Jun 22, 2016
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Just to make sure I have this correctly:
1. Acetylcholine binds to a postsynaptic membrane
2. Sodium ion channels open up, allowing influx of Na+ ions into the cell
3. In response, K+ ions exit the cell
4. Increased charge (charge that becomes less negative) in the cell due to all the Na+ ions is called depolarization
5. Once depolarization reaches an absolute threshold, an action potential occurs
6. Once action potential is completed, a Na/K pump uses ATP to move Na+ back out of the cell (3 ions) and K+ back into the cell (2 ions) in order to make the charge more negative again, in a process called repolarization
7. Sometimes the charge in the cell can become even more negative than it was before, which is called hyperpolarization
8. After hyperpolarization, the cell will return to resting membrane potential.
Is any of that incorrect? Am I missing anything important? I always get confused on this whole sequence and want to make sure I have it right now.
1. Acetylcholine binds to a postsynaptic membrane
2. Sodium ion channels open up, allowing influx of Na+ ions into the cell
3. In response, K+ ions exit the cell
4. Increased charge (charge that becomes less negative) in the cell due to all the Na+ ions is called depolarization
5. Once depolarization reaches an absolute threshold, an action potential occurs
6. Once action potential is completed, a Na/K pump uses ATP to move Na+ back out of the cell (3 ions) and K+ back into the cell (2 ions) in order to make the charge more negative again, in a process called repolarization
7. Sometimes the charge in the cell can become even more negative than it was before, which is called hyperpolarization
8. After hyperpolarization, the cell will return to resting membrane potential.
Is any of that incorrect? Am I missing anything important? I always get confused on this whole sequence and want to make sure I have it right now.
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