How does urine form in the excretory organs and how does secondary urine differ from primary?

1) First, the blood plasma is filtered in the renal capsules of the nephrons; there primary urine is formed.
2) In the convoluted tubules, water, glucose, amino acids, salts are first reabsorbed into the blood and secondary urine is formed.
3) In the secondary urine, glucose, proteins are normally absent, but a higher content of mineral salts, urea and uric acid

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