The human excretory system consists of several components. The kidneys are the primary organs responsible for filtering blood and forming urine. Urine flows from the kidneys through the ureters to the urinary bladder, where it is stored until excretion. The urethra carries urine from the bladder to the exterior during urination. Other components contributing to excretion include the skin, which eliminates small amounts of metabolic waste through sweat, and the lungs, which expel carbon dioxide during respiration. Together, these components maintain homeostasis by removing waste products, regulating water and ion balance, and ensuring the overall health of the organism.