What is one of the primary functions of the kidneys?

The primary function of the kidneys is to filter blood and form urine. This process is essential for maintaining homeostasis in the body. As blood passes through the kidneys, waste products, excess substances, and toxins are removed, allowing for the regulation of bodily fluids and electrolytes. The kidneys also help control the balance of various ions, such as sodium and potassium, which are crucial for normal cellular function.

In forming urine, the kidneys perform several key functions, including filtration of blood plasma, reabsorption of necessary substances (like water, glucose, and various ions), and secretion of waste products. The urine produced is composed of these wastes, which are then expelled from the body, playing a vital role in excreting harmful substances and regulating the body's internal environment.

This function is critical because if the blood is not adequately filtered, it can lead to a buildup of toxins and imbalances in electrolytes, which can have serious health consequences. The kidneys, therefore, are essential for detoxifying the blood and maintaining fluid balance, making the filtration of blood and formation of urine a fundamental function of these organs.