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The human body is made up of many different systems that work together to keep it alive and functioning properly. The circulatory system carries oxygen and nutrients to cells throughout the body while removing waste products. The nervous system sends signals between nerve cells, allowing us to feel sensations like touch and pain. The digestive system breaks down food into smaller molecules that can be absorbed by the body's cells. Other systems include the respiratory system, which brings oxygen into the lungs; the muscular system, which allows for movement and flexibility; the skeletal system, which provides support and protection for organs; and the integumentary system, which helps to regulate body temperature and protect against external damage.