SCIENCE
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Resting potential
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Action potential
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Neural potential
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Synaptic potential
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Detailed explanation-1: -When a neuron is not actively transmitting a nerve impulse, it is in a resting state, ready to transmit a nerve impulse. During the resting state, the sodium-potassium pump maintains a difference in charge across the cell membrane of the neuron.
Detailed explanation-2: -Therefore, when a neuron is in resting state, the axonal membrane is comparatively more permeable of K ions and nearly impermeable to Na ions.
Detailed explanation-3: -When axons are not conducting impulses (action potentials or depolarization events), they are said to be “at rest”.
Detailed explanation-4: -At resting potential concentration of ions is kept constant through Na+/K+ pumps. When the threshold is reached, the Na+ gated channel are opened. The threshold level is about-55 mV.
Detailed explanation-5: -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.