Which of the following organs is primarily involved in urine storage?

The bladder is the organ primarily involved in urine storage. It serves as a muscular sac that collects urine produced by the kidneys before it is excreted from the body. The bladder can expand and contract, allowing it to hold varying amounts of urine as it fills and empties.

Urine is produced in the kidneys, which filter waste from the blood and create urine that then travels through the ureters to the bladder. While the kidneys are essential for urine production, they do not store urine; that function belongs exclusively to the bladder. The small intestine and large intestine are part of the digestive system, primarily responsible for nutrient absorption and waste processing, but they do not have a role in urine storage.