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digestive and excretory, circulatory, urinary, integumentary, skeletal, muscular, endocrine, lymphatic, nervous, and reproductive systems. There are other systems in the body that are not organ systems--for example, the immune system protects the organism from infection, but it is not an organ system since it is not composed of organs. Some organs are in more than one system--for example, the nose is in the respiratory system and also serves as a sensory organ in the nervous system; the testes and ovaries

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