The organ that helps filter waste from blood is the kidneys. These bean-shaped organs are located on either side of the spine in the lower back. Each kidney contains about a million tiny filtering units called nephrons, which remove waste products, excess substances, and toxins from the bloodstream while conserving essential nutrients and electrolytes. The filtered waste is excreted as urine. Beyond filtering, the kidneys also play a crucial role in regulating blood pressure, balancing fluids and electrolytes, and maintaining acid-base homeostasis. Maintaining kidney health is essential for overall well-being, as their dysfunction can lead to serious health issues.