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Learn the skill
Kidneys form urine. Ureters carry it to the bladder, which stores it. The urethra carries it from the bladder to outside. This is separate from blood returning through renal veins and from stool leaving the digestive tract.
Worked example
A sign says the bladder makes urine by filtering blood. Repair it: kidneys filter blood and form urine; the bladder stores urine. Name the job, not just the organ.
A new route puzzle
A museum route has K for a kidney, S for the storage organ, tube X connecting K to S, and tube Y connecting S to outside. The route carries urine, not blood. The boxes are equal sizes for clear labels; they are not anatomical measurements. No samples, body measurements or personal health information are needed.