What is the primary function of the kidney in the human body?

The primary function of the kidney in the human body is to remove waste and excess water. The kidneys are vital organs that filter blood to eliminate toxins, excess salts, and metabolic waste products, which are then excreted as urine. This process helps maintain the body’s fluid and electrolyte balance, ensuring that the levels of substances like sodium and potassium remain within a healthy range. Additionally, the kidneys play a crucial role in regulating blood pressure and producing hormones that are important for red blood cell production and other functions.

While cleaning the blood is related to the kidney’s functions, the more precise and encompassing description is that they remove waste and excess water, directly resulting in the formation of urine.