Question

How would you compare and contrast filtration and reabsorption in a nephron?

Answer 1

Reabsorption occurs next to filtration during processing of urine in nephron.

Explanation:

Filtration:

• Firstly, blood passes through glomerulus. The walls of the glomerulus are porous.
• Thus, blood is filtered into Bowman’s capsule.
• This is a special filtration. The blood pressure in glomerulus provide the necessary filtration pressure.
• The filtrate coming out of the glomerulus is called glomerular filtrate. So, this is the end of the filtration process.

Reabsorption:

• Now, the glomerular filtrate gets its way towards the proximal convoluted tubule where the reabsorption starts.
• The filtrate contains numerous useful substances like glucose, amino acids, salts etc.
• The proximal tubule reabsorbs all the useful substances from the gromerular filtrate.
• Thus, the filtrate mostly contains nitrogenous wastes hen it leaves the proximal tubule.
  This process is called reabsorption.

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Hope it helps…