Final answer:
Urine formation includes glomerular filtration, tubular reabsorption, and tubular secretion; these processes ensure the body maintains homeostasis by effectively filtering blood and eliminating waste as urine. Option A.
Step-by-step explanation:
Urine formation is a critical function of the kidneys and involves three main processes: glomerular filtration, tubular reabsorption, and tubular secretion. During glomerular filtration, blood is filtered in the glomerulus, allowing almost all solutes to pass through except proteins.
This process depends on hydrostatic pressure which is usually greater than colloid osmotic pressure, facilitating the filtration. Tubular reabsorption occurs in the renal tubules, where most of the previously filtered solutes and water are reabsorbed back into the bloodstream.
Finally, tubular secretion happens in the renal tubules as well, where additional substances are added to the filtrate from the blood. These processes collectively contribute to the production of urine, ensuring the body can eliminate waste effectively while maintaining homeostasis. So Option A.