Normally, more than 99% of the sodium filtered at the glomerulus is returned to the blood. Most of this sodium is reabsorbed at the proximal tubule.
- The glomerulus are enveloped networks of capillaries found in the nephron of the kidney.
- The glomerulus are responsible for filtering and purifying blood plasma (such as sodium, phosphorus and potassium).
- The efferent arteriole emerges from each glomerulus, from which arises a network of peritubular capillaries and descending vasa rectus.
- Efferent fibers stimulate renin release and proximal tubular sodium reabsorption, thereby affecting renal and systemic vascular resistance.
- Reabsorption of the initial charge of the main solutes takes place in the proximal tubule.
- The reabsorption of water throughout the nephron follows the reabsorption of solutes.
- 67% of the filtered water is reabsorbed in the proximal tubule by osmosis, with the reabsorption of sodium coupled to other solutes at this level being the generator of the osmotic gradient.
Therefore, we can conclude that the sodium filtered at the glomerulus is returned to the blood. Most of this sodium is reabsorbed at the proximal tubule.
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