Insects have a large blood vessels on the back of a trunk. partial artery enlargement up called hearts pump blood to act according to certain blood vessels. to leave the blood vessel infiltration by the space inside the trunk. The blood is exposed to the direct tissue. exchanged substance. Blood tissue and will flow back to the heart by the contraction of muscles and the trunk portion shrimp has a circulation that is different from their little insects. That is, there is your heart on the head in only one place. one of the cardiac blood flowing from the gums to the external water, gas exchange, then flow back into the heart to the tissues of the body parts.
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