Final answer:
The kidney filtration process consists of glomerular filtration, tubular reabsorption, and tubular secretion, all of which contribute to urine formation.
Step-by-step explanation:
The filtration process in the kidney involves all of the following: glomerular filtration, tubular reabsorption, and tubular secretion. During glomerular filtration, blood is filtered in the glomerulus, where solutes except for proteins are filtered out. In tubular reabsorption, the renal tubules reabsorb most of these solutes, primarily in the proximal convoluted tubule. Lastly, in tubular secretion, additional solutes and wastes are secreted back into the renal tubules. Together, these processes are essential for the formation of urine and maintenance of body fluid homeostasis.