Final answer:
The bladder is an expandable muscular organ that stores urine.
Step-by-step explanation:
The correct answer is Bladder. The bladder is an expandable muscular organ that stores urine. It is located in the pelvic region and its main function is to collect and hold urine until it is ready to be excreted from the body. When the bladder is full, it signals the brain to initiate the process of urination.
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