Final answer:
The process of urine formation involves glomerular filtration, tubular reabsorption, and tubular secretion. Catabolism is not involved in urine formation.
Step-by-step explanation:
The process of urine formation involves three main steps: glomerular filtration, tubular reabsorption, and tubular secretion. Glomerular filtration occurs in the glomerulus, where substances like water, ions, and waste products are filtered out of the blood. Tubular reabsorption takes place in the renal tubules, where most of the useful substances, such as water and solutes, are reabsorbed back into the bloodstream. Tubular secretion occurs in the distal tubules and collecting ducts, where additional waste products are actively transported into the urine.
Therefore, the correct answer is A) Catabolism. Catabolism is not a process involved in urine formation. Instead, it refers to the breakdown of complex molecules into simpler ones for energy production.