Question

How does kidney reabsorbs selective material ?

Answer 1

Kidney has a basic filtration unit which is a cluster of thin walled blood cappilaries called Nephron. Each nephron has a cup shaped upper end called bowman's capsule which contains a bundle of blood capillaries called glomerulus.Urea formed in the liver enters the blood. When blood containing urea enters the glomerulus it gets filtered through glomerular cappilaries .The selectively permeable wall of the bowmans capsule allows the water molecules and the small molecules of other substances to pass through them and form glomerular filtrate. The blood,free from these materials is taken to the heart through renal vein. The glomerular filtrate collected in bowman's capsule further passes through the nephron tubule where reabsorption of useful water and molecules takes place. The remaining fluid forms the urine which eventually enters the large intestine
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Answer 2

Answer:

refer to the above attachment