The heart is part of the cardio-vascular system and is mostly assosciated with the lungs since they supply the oxygen which is infused into the blood. The heart then transfers the oxygen enriched blood throughout the body.
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Lungs
Kidneys
Brain.
The skin is the largest organ, but of the two organs quoted in the question, the liver is larger than the heart.
The three major organs of the circulatory system are: The Heart, The Brain and The Lungs: