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.
Organ Systems. 1  1. Circulatory System: The main function of this system is to transport nutrients and gasses to cells and tissues throughout body.2  This is accomplished by the circulation of blood. 3  Cardiovascular: This system is comprised of the heart, blood, and blood vessels. Cardiovascular organs: heart, blood vessels, blood. 2  Lymphatic: This system is a vascular network of tubules and ducts that collect, filter, and return lymph to blood circulation. 3  As a component of the immune system, the lymphatic system produces and circulates immune cells called lymphocytes.