A city's transportation system is a network of streets, highways, and subway or train lines that deliver food and goods to the city and remove wastes from it. The human body's major transportation system is a closed circulatory system made up of a heart, blood vessels, and blood. Like people in a city, the body's cells need food and goods that are produced elsewhere. They also need to get rid of their garbage and other wastes. Some cells, such as blood cells, also need a way to move around the body similar to people moving around a city
