What is the primary role of the kidneys?

The primary role of the kidneys is to filter blood and remove waste. This critical function is part of the body's overall method for maintaining homeostasis. The kidneys are responsible for the excretion of waste products, such as urea and creatinine, which are generated by the body's metabolic processes. They filter the blood to remove these toxins and excess substances, balancing the body’s electrolytes, fluid levels, and blood pressure in the process.

Additionally, the kidneys help regulate the body's pH level, contributing to acid-base balance. This filtration process also produces urine, which is then excreted from the body. Through this complex system, the kidneys play an essential role in detoxifying the blood and ensuring that essential nutrients and water are retained while waste products are eliminated. This is why the kidneys are often referred to as the body's natural filtration system, emphasizing their primary role in maintaining internal balance and health.