Question

In the given diagram, which stage of conduction of nerve impulse through nerve fibre is observed?

• A. A- Polarized zone, B- Depolarized zone
• B. A- Repolarization, B- Polarization
• C. A- Depolarized zone, B- Polarized zone
• D. A- Resting potential, B- Polarized zone

Answer 1

The correct option is C A- Depolarized zone, B- Polarized zone

When a neuron is not stimulated, its membrane is polarized. Being polarized means that the electrical charge on the outside of the membrane is positive while the electrical charge on the inside of the membrane is negative. The outside of the cell contains excess sodium ions ($N{a}^{+}$); the inside of the cell contains excess potassium ions ($K^{+}$). When the neuron is inactive and polarized, it's said to be at its resting potential. It remains this way until a stimulus comes along. Thus the correct answer is option C.