Question

What is reabsorption? Where does it take place?

Answer 1

Reabsorption:

1. Blood is filtered in the glomerulus. The filtrate contains a great amount of water, salts, glucose, amino acids, and other useful substances.
2. Reabsorption refers to the absorption of these useful substances from the glomerular filtrate.
3. Out of 125 litres of glomerular filtrate, only 1 litre is excreted as urine. This suggests that about 99% of filtrate is reabsorbed.
4. The reabsorbed materials are sent back to the bloodstream.

Site of reabsorption:

1. Reabsorption takes place in the ‘kidney tubule or nephron’.
2. Different parts of the kidney tubule such as proximal & distal convoluted tubules, Henle's loop, and collecting duct play a major role in reabsorption.
3. Most of the reabsorption takes place in proximal convoluted tubules (PCT).