Chapter 9: Homeostasis Beta
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SBI4U Biology · 9.5
Reabsorption along the tubule and loop of Henle
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Reabsorption along the tubule and loop of Henle
- The step that returns water, ions and nutrients from the filtrate to the blood.
- Roughly 50 % of urea returns to the blood at the proximal tubule; the remainder travels on in the filtrate, and loss of water makes it more concentrated.
- Proximal tubule: microvilli greatly widen the surface; about 65 % of the water and 67 % of Na+, K+ and Cl- return here, with nearly all glucose and amino acids, through pumps and carrier proteins, and water follows through aquaporin channels.
- Loop of Henle: water leaves along the descending limb; Na+ and Cl- leave along the ascending limb.
- Distal tubule: more water and salts are removed.