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The human body is made up of a complex network of systems that work together to keep us alive and functioning properly. The circulatory system, which includes the heart, arteries, veins, and blood vessels, plays a crucial role in transporting oxygen and nutrients to cells throughout the body. The nervous system, which includes the brain, spinal cord, and nerves, allows for communication between different parts of the body and enables us to move, think, and feel emotions. The immune system, which includes white blood cells, helps to fight off infections and diseases that can harm the body. The digestive system, which includes the mouth, esophagus, stomach, small intestine, and large intestine, breaks down food into nutrients that the body can use for energy and growth. The respiratory system, which includes the lungs, trachea, bronchi, and diaphragm, brings oxygen into the body and removes carbon dioxide. The skeletal system, which includes bones, cartilage, and ligaments, provides support and structure to the body. The muscular system, which includes muscles, tendons, and ligaments, enables movement and maintains posture.