GC Metals Non-Metals

Which one of the following elements is needed in the human body to transfer electrical signals by nerve cells?

  1. Lithium
  2. Sodium
  3. Rubidium
  4. Caesium

Answer

When a membrane is resting, or not being stimulated, it is said to have resting potential. Ions inside the cell, particularly potassium, sodium and chlorine, maintain the electrical balance. Axons depend on the opening and closing of voltage-gated sodium and potassium channels to conduct, transmit and receive electrical signals.

The correct option is B.