What enters the renal tubule?

The renal tubule receives filtrate from the renal corpuscle, which includes water, ions, glucose, amino acids, and waste products like urea and creatinine. As the filtrate passes through the proximal convoluted tubule, loop of Henle, distal convoluted tubule, and collecting duct, various substances are reabsorbed or secreted, contributing to the final composition of urine. This process is crucial for maintaining fluid and electrolyte balance in the body.