Which organ is responsible for filtering blood and producing urine?

The kidneys are vital organs in the urinary system. They filter waste products, excess substances, and fluids from the blood to form urine. Each kidney contains about one million nephrons, which are the functional units responsible for this filtration process. Blood enters the kidneys through the renal arteries, is filtered in the nephrons, and then exits through the renal veins. The filtered waste is collected in the renal pelvis, passes through the ureters to the bladder, and is eventually excreted as urine. This process helps maintain the body's electrolyte balance, blood pressure, and overall homeostasis.