SCIENCE
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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refractory period
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hyperpolarization
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resting membrane potential
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threshold potential
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Detailed explanation-1: -Answer: The membrane potential (Vm) is the voltage across the neuronal membrane at any moment in time. The potential of the resting membrane is –75 mV.
Detailed explanation-2: -The bioelectric potential across a cell membrane is typically about 50 millivolts; this potential is known as the resting potential.
Detailed explanation-3: -The resting potential of neurons is about-70 mV. At resting potential concentration of ions is kept constant through Na+/K+ pumps. When the threshold is reached, the Na+ gated channel are opened.
Detailed explanation-4: -The relative excess of positive charges outside and negative charges inside the membrane of a nerve cell at rest is maintained because the lipid bilayer acts as a barrier to the diffusion of ions, and give rise to an electrical potential difference, which ranges from about 60 to 70 mV.