What type of circulatory system uses blood vessels for circulation?

A closed circulatory system utilizes blood vessels for circulation, distinguishing it from an open circulatory system, where blood is not entirely contained within vessels. In a closed system, blood circulates through a network of arteries, veins, and capillaries, allowing for efficient transport of nutrients, gases, and waste products throughout the body. This system enables a higher blood pressure and more efficient delivery of oxygen and nutrients to tissues compared to open systems, which rely on a hemolymph that bathes organs directly. Examples of organisms with closed circulatory systems include humans and other vertebrates, emphasizing the complexity and adaptability of this type of circulatory arrangement.