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The function of the nervous system is to be the command center of the systems, through electric pulses to tell them what to do. There is a peripheral nervous system and a central nervous system. The nervous systems work with all the systems, making sure everything is happening according to plan.

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The function of this system is to get rid of liquid waste. Some parts of the system are kidneys, the liver, and your urinary bladder. The nervous system assists the excretory system. The excretory system helps the nervous system by getting rid of the waste when the nervous system sends signals. The Nervous system helps the excretory system by telling it when to release waste.

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The function of the digestive system is to convert food into energy/nutrients for the body. There are many parts to this system, some are the rectum, esophagus, stomach, and the large and small intestine. This system works with the the excretory system helps the digestive system by getting rid of waste. The digestive system helps the excretory system by breaking down food to be eliminated from the body.

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The function of the circulatory system is to fight diseases and circulate blood throughout the body. Components of blood are plasma, red blood cells, white blood cells, and platelets. The circulatory system also helps the digestive system.

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The function of the respiratory system is to take in oxygen and let out carbon dioxide. The most broad description of the parts involved are the lungs and the heart. In this process, the circulatory system is there to help! All the body systems are interlaced and depend on each other to help the body.