Concept:Urine flows through the excretory organs in a fixed sequence from filtration to excretion.Explanation:Kidneys filter blood to produce urine.From each kidney, a ureter carries urine downward to the urinary bladder.The urinary bladder stores urine temporarily.Finally, urine passes through the urethra to exit the body.Thus the correct order is: Kidney → ureter → urinary bladder → urethra.
