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Sodium Reabsorption

Meaning

Sodium Reabsorption is the physiological process occurring predominantly within the renal tubules where filtered sodium ions ($text{Na}^+$) are actively transported from the tubular lumen back into the systemic circulation. This process is essential for maintaining extracellular fluid volume, blood pressure, and electrolyte balance. Endocrine control over this mechanism, particularly via aldosterone and angiotensin II, is central to fluid homeostasis. Clinical evaluation of this process informs the management of hypertension and edema.