What is one of the primary functions of the kidneys?

One of the primary functions of the kidneys is to filter waste from the blood. The kidneys play a crucial role in the body's excretory system by removing waste products and excess substances from the bloodstream, which are then eliminated from the body through urine. This process helps maintain the body's fluid balance, electrolyte levels, and overall homeostasis. By effectively filtering out toxins, excess ions, and metabolic byproducts, the kidneys contribute significantly to the body's cleansing processes and help regulate blood pressure and pH balance.