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-The insect circulatory system consists of the heart, aorta, and blood. Blood flows into the heart through small openings called ostia. The Ostia have valves that allow blood to enter the heart but prevent it from escaping. Contractions of the heart pump the blood to the head through the aorta, which is the insect's only blood vessel. The blood travels back to the heart by flowing through the body cavity, supplying nutrients and removing wastes as it bathes the organs. -A mammal's blood flow vigorously to provide oxygen; otherwise, the cells would quickly die form lack of oxygen. In contrast, an insect's blood does not supply oxygen to the cells. Since the cells do not depend on the blood for oxygen, the blood can flow much less vigorously and still keep supplied with needed nutrients.
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