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organ systems

skeletal Answer
integumentary Guards against infection and injury; helps regulate body temperature
Muscular With skeletal system, produces movement; helps circulate blood and move food through the digestive system
Circulatory Transports oxygen, nutrients, and wastes; fights infection; helps regulate body temperature
Respiratory Brings in oxygen needed by cells; removes carbon dioxide from body
Digestive Breaks down food; absorbs nutrients; removes food wastes
Excretory Removes waste products from the body
Nervous Controls the body's responses to changes within the body and outside it
Endocrine Controls growth, development , and energy processes; helps maintain homeostasis
Reproductive Produces and delivers sex cells; in females, nurtures and protects developing embryo
Immune Fights infections; attacks invading bacteria and viruses
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