Labels:bag | cake | person | plaything | sky | tree | tribute album OCR: BLADDER OUR BL ADDER is a bag -like organ that is found at the bottom of the low er abdomen. It stores the waste liquid called urine that is produced by your two kidneys. The bladder walls are stretchy and muscular, enabling it to expand as urine enters it through two tubes ca alled ureters. Once full, the bladder walls contract to squeeze the urine out the body along muscu lar tube. called the urethra Muscular bladder wall Lining of the bladder Pubic bone Urethra Form front of pelvis Cartilage enal bling Forms