Question

During depolarisation of neuron

• A. $K^{+}$ channels remain open
• B. N$a^{+}$ gets inside through ion channels
• C. N$a^{+}$ gets outside through ion channels
• D. All the above

Answer 1

The correct option is B N$a^{+}$ gets inside through ion channels

The depolarization, also called the rising phase, is caused when positively charged sodium ions (Na+) suddenly rush through open voltage-gated sodium channels into a neuron. As additional sodium rushes in, the membrane potential actually reverses its polarity.

Hence the correct option is B.