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
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.