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The human body is made up of many different systems that work together to keep us alive and functioning properly. The circulatory system transports oxygen and nutrients throughout our bodies, while the nervous system helps us think and move by sending signals through our brains and spinal cords. The digestive system breaks down food into nutrients that are absorbed by our intestines and used for energy. The respiratory system takes in oxygen from the air we breathe and releases carbon dioxide as a waste product. The muscular system is made up of skeletal muscles that allow us to move and maintain posture, while the integumentary system protects us from external damage with its skin and other tissues.