The bladder is classified as what type of organ?

The bladder is classified as a hollow organ because it is structured to store fluids, specifically urine in this case. Hollow organs are characterized by having a lumen or cavity that allows them to hold substances. The bladder's ability to expand and contract is essential for its function, enabling it to store urine and release it during urination.

In contrast, solid organs like the liver or spleen have a more fixed structure and are not designed to hold fluids. Muscular organs can describe various structures that are primarily composed of muscle tissue, but the bladder's defining feature is its hollow nature. Connective organs are not a standard classification in anatomy, as connective tissue serves a different purpose in the body by supporting and connecting other tissues and organs rather than characterizing the organ's overall structure or function.