About 150 L of plasma filters into the renal tubules each day, but only 1-2 L of urine is formed because the rest of the plasma is reabsorbed into the blood stream.
Renal tubules are the part of the nephron of the kidney. It is composed of further components called: the proximal convoluted tubule, the loop of Henle and the distal convoluted tubule. Their functions is to return the required substances back into the blood.
Urine is the final waste fluid produced due to the process of excretion by kidneys. It is stored in a organ called bladder until is eliminated out from the body. The composition of urine is water, urea, salts, etc.
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