AP BIOLOGY

Detailed explanation-1: -The closed circulatory system makes it possible for animals to send blood to certain parts of the body, moving blood faster and farther. That’s why larger animals often have closed systems, which are common among birds, mammals, fish, reptiles, amphibians, and some invertebrates.

Detailed explanation-2: -The circulatory system is effectively a network of cylindrical vessels: the arteries, veins, and capillaries that emanate from a pump, the heart. In all vertebrate organisms, as well as some invertebrates, this is a closed-loop system, in which the blood is not free in a cavity.

Detailed explanation-3: -CLOSED CIRCULATORY SYSTEM: The blood is pumped by the heart and circulated through closed network of blood vessels. The blood does not come in direct contact with the tissue cells. Blood capillaries are present. This type of circulatory system is found in annelids such as Pheretima, and many chordates.

Detailed explanation-4: -In a closed circulatory system, blood is contained inside blood vessels and circulates unidirectionally from the heart around the systemic circulatory route, then returns to the heart again. As opposed to a closed system, arthropods– including insects, crustaceans, and most mollusks– have an ‘open’ circulatory system.