Respiratory System: Trachea, Lungs, Nose, Takes in oxygen from outside environment, Releases carbon dioxide out of body , Circulatory System: Blood, Vessels, Heart, Also known as Cardiovascular System, Transports gases and substances (nutrients) around the body , Digestive System: Esophagus, Stomach, Intestines, Breaks down food into useful substances, Helps absorb nutrients into blood, Nervous System: Nerves, Brain, Spinal Cord, Controls all the other systems, Sends messages around the body to respond to its environment ,

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