Question

Resting membrane potential of a neuron is approximately
a. -70mv
b. +70 mV
c. 0.7V
d. +0.7V

Answer 1

Hint: Membrane potential or membrane voltage is the difference in the electric potential or voltage between the interior and exterior of the nerve membrane, and this membrane potential occurs when there is a spike in the impulse of an action potential.

Complete answer:
- The action potential is the mode through which the electric signals are transported in the neurons, which are produced due to change in the voltage due to differences in ions inside and outside of the cell.
- Resting membrane potential: The value of the resting membrane potential is different, in various types of cells, in neurons is in the range of -70mv to -80mv, and it depends on the type of ion channels, and type of ions concentrated around the membrane.
- Usually, in the resting membrane potential of neurons, the concentration of potassium is more.
- $K^{+}$ ions are more in concentration and are present inside the membrane.
- Whereas the concentration of $Na^{+}$ , $Cl^{-}$ ions concentration is more on the external surface of the membrane.
- This change in membrane concentration gradients causes the movement of ions when the channels are open. And majorly in resting membrane potential, the membrane is more permeable to $K^{+}$ ions.
- The value of the resting membrane potential is equivalent to the equilibrium potential.

Hence, the correct answer is option (A).

Note: The ion channels present on the membrane of neurons, which is responsible for membrane potential is voltage ion channels, in the neurons, the depolarization occurs, if the interior voltage becomes, less negative than the resting membrane potential, while if the inferior voltage becomes more negative then hyperpolarization across the membrane occurs.