The heart is the main organ of the circulatory system. The job of the circulatory system is to transport oxygen and nutrients throughout the body. The heart has 4 chambers. Two of the chambers receive blood and two of the chambers pump blood out of the heart. The heart is also broken up into right and left halves. The right half of the heart receives deoxygenated blood and pumps it to the lungs to get oxygen. The left half of the heart receives oxygenated blood from the lungs and then pumps blood to the body. Nutrients and oxygen are delivered to cells so that growth, reproduction, movement, etc., can continue.
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