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4 Cards in this Set
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- Back
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What is hyperkalemia? |
Hyperkalemia is too much extracellular K+. - Less K+ leaves the cell, some might even come in. - inside cell gets MORE POSITIVE - a small depolarization happens, means the cell gets closer to threshold. - more likely to fire, less stimulation needed. - or gets unwanted AP's. - problems with repolarization (cells cant get back to resting potential because K+ wont leave. |
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What is hypokalemia? |
Hypokalemia is too little extracellular K+. - nothing for NA+K+ pump to pump in - more K+ leaves - inside of cell gets MORE NEGATIVE - slight hyperpolarization, less likely to fire. |
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What happens to neurotransmitters after their released? |
1. An enzyme breaks them down 2. Re-uptake: the neuron takes back the neurotransmitter 3. They just drift away |
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What about K+? |
There are such things as leak channels (non-gated in channels) which remain open at all times. Intracellular to extracellular |
