circulatory system - heart, blood, blood vessels, respiratory system - lungs, trachea, bronchial tubes, alveoli, nervous system - brain and nerves, integumentary system - skin, skeletal system - bones, cartilage, ligaments, digestive system - mouth, esophagus, stomach, liver, pancreas, small intestines, excretory system - kidney, ureters, urinary bladder, urethra, endocrine system - glands like pituitary and thyroid, reproductive system - sperm ducts, urethra, testes, uterus, ovary, vagina, muscular system - muscles,

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