Gastropods have a circulatory system rather similar to humans. These animals have two chambers; an auricle, which receives haemolymph from the gill or lung, and a ventricle which pumps it into the aorta. However, some primitive gastropods possess two gills, each supplying its own auricle, so that their heart has three chambers. All gastropods have two gills, each supplying its own auricle. Having a rather short aorta, it operates into two main vessels. These main vessels are connected to the heart which makes some scientists believe that they may have two aortas. the main anterior artery, which supplies the head and foot includes an enlarged muscular region and helps blood to flow throughout the body.