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Organ (Anatomy)In biology, an organ (Latin organum: instrument, tool) is a group of tissues, which perform a specific function or group of functions. Common animal organs include the heart, lungs, brain, eye, stomach, spleen, pancreas, kidneys, liver, intestines, skin, uterus, bladder, bone, etc. A group of related organs is an organ system. Organelles are analogous sub-cellular structures. Organ systems
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