NEPHRON, Small but strong, I clean your blood with care—Tiny kidney unit, always there. What am I?, GLOMERULUS, I filter blood first—Small pass, big stay. Where does it begin?, KIDNEY STONES, From minerals I form, I cause sharp pain and block the way. What am I?, URETHRA, When the bladder says “go,” I open—what am I?, KIDNEYS, We filter blood and keep you fine—Twin organs by the spine. What are we?

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