Through an individual project, students learned about human body systems. There are many human body systems, including the digestive, reproductive, endocrine, skeletal, muscular, lymphatic, integumentary, and urinary systems. For example the circulatory and cardiovascular systems help keep blood pumping through the body, the respiratory system that continuously makes oxygen available to the body and removes carbon dioxide, the nervous system that sends messages throughout the body, and the immune system that helps the body respond to pathogens.