2.72 Water re-absorption

Key Points:
1. In the Bowmans capsule, ultrafiltration takes place. The blood goes into the kidney under high pressure, and the plasma is forced into the bowmans capsule tube, or the glomerula filtrate, and this contrains glucose water, salts and urea. When the filtration occurs, too much water is filtered.
2. As the filtrate passes along the tubule, when it reaches the collecting duct, what happens is that water is removed from the filtrate.
3. That water is returned back to blood vessels.
4. The water has been selected and has been re-absorbed into the blood, or selective re-absorption.