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In biology, an organ ( Latin: organum, "instrument, tool") is a group of tissues that 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 - Contents
Organ system – a system composed of organs working together to carry out a function.
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Circulatory system
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Digestive system
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Endocrine system
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Integumentary system
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Lymphatic system
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Muscular system
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Nervous system
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Reproductive system
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Respiratory system
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Skeletal system
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Urinary system
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