EVERYDAY SCIENCE

Detailed explanation-1: -A closed circulatory system, found in all vertebrates and some invertebrates, circulates blood unidirectionally from the heart, around the body, and back to the heart.

Detailed explanation-2: -Open circulatory system: It is primarily found in invertebrates. Here, the blood flows freely through cavities since there are no vessels to conduct the blood. Closed circulatory system: It is found in vertebrates and a few invertebrates, like earthworms. This system has vessels that conduct blood throughout the body.

Detailed explanation-3: -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-4: -All vertebrates, however, have a closed system-that is, their circulatory system transmits fluid through an intricate network of vessels.

Detailed explanation-5: -Examples of animals with a closed circulatory system are annelids and vertebrates (including humans). Humans have a cardiovascular system comprised of heart and blood vessels that circulate blood throughout the body and another system for circulating lymph called lymphatic system.