Sodium in biology
= Sodium in biology
{wiki=Sodium_in_biology}
Sodium is an essential chemical element in biology, with the symbol Na and atomic number 11. It is a positively charged ion (cation) in its ionic form, usually represented as Na⁺. Sodium plays several critical roles in biological systems, including: 1. **Osmoregulation**: Sodium is crucial in maintaining fluid balance and osmotic pressure in cells and tissues. It helps regulate the movement of water across cell membranes.