Final answer:
The kidneys filter waste products from the blood and help maintain homeostasis by removing waste chemicals and excess water.
Step-by-step explanation:
The kidneys filter waste products from the blood and help maintain homeostasis by regulating water balance and pH levels. The kidneys receive approximately 1.5 quarts of blood per minute, which is filtered to remove waste chemicals and excess water, resulting in urine production. Kidney function tests are used to assess the efficiency of this filtration process.