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....The Circulatory System moves blood throughout the body. It carries antibodies
which fight disease and transports chemical messengers called hormones. The
Circulatory System is made up of lots of tiny little vessels.
....The main parts of the circulatory system are the heart, arteries, veins and
capillaries. The aorta is the largest and biggest artery of blood.This system is
the transportation and the cooling system for the whole body. RBCs in the
circulatory system can carry nutrients and oxygen throughout the body and into the
cells. There are also white blood cells that are moving through the circulatory system.
... Inside the circulatory system, there are a group of organs that carry blood into the
body.The circulatory system has two parts - one part is for Systemic Circulation and
the other is for Pulmonary Circulation. The systemic circulation part makes the system
one whole except for the lung. The other part is for pulmonary circulation. This part
can carry blood to the lungs. 
Video Clips:
How is our heart different from that of an ant?