Respiratory System - windpipe (trachea), lungs, alveoli, Digestive System - Stomach, small intestine, oesophagus, Excretory System - Kidney, liver , Reproductive System - Ovaries, testes, Circulatory System - Heart, arteries, veins , Sensory System - Eyes, ears, nose, Nervous System - Brain, nerves, spinal cord,

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