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The Circulatory System Created by: Katlin & Morgan Sponges Sponges do not have a true circulatory system. A water flow system performs this function for it instead. Earthworms The earthworm has two main blood vessels – the The dorsal and has ventral, which carry blood worm the simplest toward either the head or the tail. The dorsal closed circulatory system. vessel moves the blood the This means thattowards the blood is head and the ventralconfined vessel moves the blood to the tail. Near to vessels, arteries, the head thereetc. are five secondary vessels that organs, serve as the worms “hearts” because they connect the dorsal and ventral vessels. Frogs The either frog has closed circulatory system with Before of athose steps occur, the oxygen richa and three poor chamber center of the oxygen bloodheart mixbeing in thethe heart before being system.again. BloodThe withfrog’s oxygen in it goessystem into the separated circulatory is very heartto and throughexcept the heart’s various processes, similar humans, they have a three chamber oxygen laden blood forcedof toblood all of to theoccur. cells heart which allows theismixing needinghave its nutrients. The oxygen poor blood Humans a four chamber heart which does not leaves allow this.the heart in a series of arteries which lead it to the lungs to be provided with oxygen. Humans Humans have a closed circulatory system which uses blood to transport nutrients, wastes, carbon dioxide, oxygen and hormones. The human heart uses a two pump system. One of the pumps is used to send the oxygen poor blood to the lungs and the other pump is used to send oxygen rich blood throughout the body. A system of blood vessels sends the blood to all the parts of the body. Veins carry oxygen poor blood towards the heart and arteries carry oxygen rich blood around the body. The End!