Tetraethylammonia, a toxin that blocks potassium channels, will More than one answer may be correct. Question 10 options: prevent the establishment of a resting membrane potential cause neurons to be unable to generate any action potential lengthen the duration of a neuron action potential increase neuron membrane Na+ conductance decrease neuron membrane K+ conductance
Tetraethylammonia, a toxin that blocks potassium channels, will
Question 10 options:
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prevent the establishment of a resting membrane potential |
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cause neurons to be unable to generate any action potential |
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|
lengthen the duration of a neuron action potential |
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increase neuron membrane Na+ conductance |
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decrease neuron membrane K+ conductance |
Introduction :
There are three phases of action potential. These are depolarisation, repolarisation and hyperpolarisation.
Depolarisation is caused by opening of sodium(Na+) channels. Now, there will be influx of Na+ ions inside the cell. As a result, the membrane potential moves towards positive side i.e from -70mV to around +30mV(at the end of depolarisation).
At this potential (+30mV), these Na+ - channels close and there will be oepning of potassium (K+) channels. As a result, K+ ions efflux out of the cell. The membrane potential will drop towards negative side. This phase is called repolarisation phase.
The potential of the membrane still drops even below -70mV. This is called as hyperpolarisation phase. This is due to prolonged K+ efflux.
The membrane potential comes back to restong membrane potential. This is done by Na+ - K+ ATPase pump.
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