Final answer:
Tubular reabsorption occurs in different parts of the renal tubule, including the proximal convoluted tubule (PCT), loop of Henle, distal convoluted tubule (DCT), and collecting ducts, where various substances are reabsorbed into the blood. The reabsorption process involves the active or passive transport of nutrients, ions, and water.
Step-by-step explanation:
Tubular reabsorption occurs in the renal tubule, specifically in the proximal convoluted tubule (PCT), loop of Henle, distal convoluted tubule (DCT), and collecting ducts. In the PCT, most nutrients such as glucose, amino acids, and ions like Na+ and Ca++ are actively or passively reabsorbed, while water is reabsorbed through aquaporin channels. In the loop of Henle, water and ions are reabsorbed to create a concentration gradient.