n a committee set up to prepare and arrange topics to be discussed, the order of business, etc., for a legislative assembly or other body. vigilance committee. n (in the U.S.) a self-appointed body of citizens organized to maintain order, punish crime, etc., where an efficient system of courts does not exist.
Best Answer: Annelids have closed circulatory systems, which means that blood is always contained by blood vessels. Some mollusks and arthropods, on the other hand, have open circulatory systems, which means that at some time, blood from the heart will pump into the hemocoel or blood cavity.n Annelids, the blood vessels end up with capillaries. Hence called closed BVS. In cockroach it is open BVS as blood vessels don't end up with capillaries. Hence, the blood vessels bluntly open into body cavities. NOTE: Circulatory system is also called BVS.
How does the structure of arteries and veins relate to their functions? Arteries - transports oxygenated blood from the heart (except in pulmonary artery which contains deoxygenated blood). Arteries have: -thick muscular wall. -much elastic tissue. -small lumen relative to diameter. -not permeable. -valves in pulmonary artery and Aorta only. -blood under high pressure (10-16kPa)