PHYSIOLOGY
NEUROTRANSMISSION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
Once-55mv is reached, which is due to the influx of sodium ions into the neuron, depolarization will occur, an action potential will occur, all of the sodium gates will open allowing sodium to enter the neuron, and the transmembrane potential will rapidly become more positive.
|
|
True
|
|
|
False
|
|
|
Either A or B
|
|
|
None of the above
|
Explanation:
Detailed explanation-1: -When the depolarization reaches about-55 mV a neuron will fire an action potential. This is the threshold. If the neuron does not reach this critical threshold level, then no action potential will fire.
Detailed explanation-2: -Sodium influx through specific ion channels in the neuronal membrane causes a depolarizing inward current. Once open, sodium channels inactivate and cannot pass further current until they recover from inactivation.
Detailed explanation-3: -The threshold potential opens voltage-gated sodium channels and causes a large influx of sodium ions. This phase is called the depolarization.
There is 1 question to complete.