A person forms 180 L of filtrate in a day and passes 1.5 L of urine…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A person forms L of filtrate in a day and passes L of urine. NCERT says that the PCT takes back to of the water.
- How much filtrate is left after the PCT if it takes back ?
- How much is left if it takes back ?
- How much water do the later parts of the nephron take back if the PCT takes back ?
Need a reminder? The key ideaShow
Urine forms by filtration, reabsorption and secretion. The glomerular filtration rate (GFR) is about mL/min, which is L a day. About of the filtrate is reabsorbed, and about L of urine is passed. The PCT takes back all the essential nutrients and to of the electrolytes and water. The kidneys receive to mL of blood a minute. The tubule secretes H, K and ammonia.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Filtrate: L. Urine: L.
Plan. Find the share that is left, then take away the urine for the later parts.
Step 1. At . is left. L.
Step 2. At . is left. L.
Step 3. The later parts, at . L.
Answer: L; L; L.
Check. At the later parts take back L, which is less. The loop, the DCT and the collecting duct still take back a lot of water.
Watch out. Many physiology books give for the PCT. A NEET question follows NCERT.
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