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The human body is a complex machine made up of many different systems that work together to keep us alive and functioning properly. The nervous system, which includes the brain and spinal cord, plays a key role in controlling the other systems and helping us think, move, and feel sensations. The circulatory system, which includes the heart and blood vessels, is responsible for pumping blood throughout our bodies and supplying our cells with oxygen and nutrients. The digestive system, which includes the mouth, esophagus, stomach, and intestines, breaks down the food we eat into smaller molecules that can be used by our bodies. The respiratory system, which includes the lungs and airways, brings oxygen into our bodies and removes carbon dioxide.