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organ system
A collection of organs that have related roles in an organism's functioning. Eleven major organ systems are present within humans and animals, although some animals lack one or more of them. They are:
- skeletal system
- muscular system
- integumentory system (skin)
- nervous system
- digestive system
- excretory system
- repiratory system
- circulatory system
- lymphatic system
- endocrine system
- reproductive system
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