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The circulatory system is almost the most important system of all of the different body systems because it supplies the body with the blood and nutrients it needs to function properly and maintain life and movement. The heart is a muscular organ that lies behind the ribcage and between the lungs and is a pump that keeps this transport system moving. Normally a person's heart is as big as their fist while it is clenched; the heart is made up of thick muscly walls and is divided into two separate pumps. The heart is about the size of your clenched fist, it has thick muscular walls and is divided into two separate pumps and each of these pumps has two more chambers. The upper chamber (atrium) receives blood that is coming in from the veins and the blood flows through a one-way valve, which makes ensures it always moves in the...

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