Question

Depolarisation of nerve cell involves

• A. Influx of $K^{+}$
• B. Influx of N$a^{+}$
• C. Influx of C$a^{2+}$ and Cl
• D. Efflux of N$a^{2+}$
• E. Efflux of C$a^{2+}$ and Cl

Answer 1

Answer: (B)

Influx of N$a^{+}$

B. Influx of Na+

Reason: When the membrane of the neuron is at rest, the higher concentration of Na+ ions keeps the outer environment more positive than the inner environment and the polarization remains intact. When the neuron gets stimulated, the Na+ infflux channels opened and Na+ ions started to enter across the membrane and depolarization occurs. So the correct option is B.