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
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.