How does urine formation in the organs of excretion occur and how does secondary urine differ from primary urine?

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

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