Which muscular sac stores urine before it is excreted from the body?

• A. Cervix
• B. Bladder
• C. Kidneys
• D. Gall Bladder

Answer: (B)

The bladder is the muscular sac that stores urine until you’re ready to urinate. It fills as urine flows down from the kidneys through the ureters, and its smooth muscle (the detrusor) allows it to relax and expand to hold urine. When you sense fullness, you can control the discharge through the external sphincter and pelvic floor, and the bladder contracts to push urine out through the urethra when you urinate. The kidneys form and continuously produce urine, but they don’t store it. The cervix belongs to the reproductive system, not urine storage, and the gall bladder stores bile, which is involved in digestion, not urine.