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The human body has many complex systems that work together to keep us alive and functioning properly. The nervous system is a network of nerve cells called neurons that transmit signals throughout the body. It is responsible for controlling movement, regulating body temperature, and facilitating communication between different parts of the body. The circulatory system, on the other hand, is made up of blood vessels that transport oxygen and nutrients to cells and remove waste products. The heart pumps blood throughout the body, while arteries carry oxygenated blood away from the heart to the rest of the body. Veins return deoxygenated blood back to the heart. The respiratory system brings oxygen into the body through the process of breathing. Air enters the lungs through the mouth or nose and passes through a network of airways before reaching the alveoli, where it is exchanged for carbon dioxide. The kidneys filter waste products from the blood and regulate electrolyte levels, while the liver detoxifies harmful substances. The digestive system breaks down food into nutrients that can be absorbed by the body. Food enters the mouth, where it is chewed and mixed with saliva that contains enzymes to break down carbohydrates. The tongue helps mix the food with saliva, while the teeth grind the food into smaller pieces.