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Comparative Anatomy CIRCULATORY SYSTEMS Protists Materials diffuse into the cell and are distributed within by cyclosis. Hydra The Hydra has no specialized transport system. - Since the hydra is only two cells thick all of the cells are in direct contact with the surrounding environment. - Items follow diffusion Grasshopper The grasshopper has: An internal OPEN CIRCULATORY SYSTEM: No network of vessels A Tubular heart which pumps blood into the AORTA: A large muscular blood vessel which squirts blood into the… SINUSES: large cavities where blood bathes cells. Blood re-enters the heart through a series of ostia (openings). Grasshopper The blood of a grasshopper does NOT contain hemoglobin! So it can’t carry oxygen. It carries food and wastes. The grasshopper is basically hollow inside, with blood squirting everywhere, like a lemonade machine Earthworm Since the worm has many cells NOT in contact with the external environment, it needs a circulatory system to distribute materials throughout its body. It Possesses a CLOSED circulatory system: It has blood vessels to contain the blood. Contains red pigment called hemoglobin. It carries oxygen. Moved through the vessels by the pumping of 5 pairs of aortic arches (hearts). The exchange of materials takes place between blood and body cells through the walls of the smallest blood vessels called capillaries. Earthworm