+The **bladder** is a muscular sac, expanding to temporarily hold [urine](/wiki/urine). It's a crucial component of the [urinary system](/wiki/urinary_system), regulating the body's fluid balance.
+## See also
+- [Kidney](/wiki/kidney)
+- [Ureter](/wiki/ureter)
+- [Urethra](/wiki/urethra)
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