blindlove2
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Davies Chemistry
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Trying to be really brief:
1. There are several million nephrons in each kidney.
2. Each is a tiny tube with its own blood supply
3. At the top end of the nephron is the Bowman's capsule where the blood is filtered.
4.The cells and larger most proteins in the blood are too big to pass through the holes in the filter and stay in the blood
5. The filtrate is the stuff that enters the nephron. it will contain water NaCl, glucose, amino acids and urea.
6. This filtrate will form the urine but before it is excreted some things need to be taken out of it and put back in the blood.
7. Glucose and amino acids are too valuable to be excreted and are reabsorbed back in to the blood stream at the proximal tubule (first bit of the nephron)
8. Most of the water needs to be taken back in to the blood stream too-otherwise you would get dehydrated. This occurs in the proximal tubule, the loop of Henle and the last bit of the nephron, the distal tubule.
9. Urine leaves the nephron into a collecting duct which drains away (eventually) to the bladder.

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