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sodium
Sodium
Na⁺, atomic number 11. Principal extracellular cation (137–145 mmol/L plasma). Inward Na⁺ flux through Nav channels generates the depolarising upstroke of action potentials in neurons and cardiomyocytes. The Na⁺/K⁺-ATPase maintains the gradient; NCX1 couples Na⁺ to Ca²⁺ efflux.
Entry Metadata
| Field | Value |
|---|---|
| ID | sodium |
| Name | Sodium |
| Status | draft |
| Last reviewed | 2026-06-05 |
| Atlas | 01-human |
| Scale | 02-atomic |