It is to pump blood to the body and to oxygenate the blood.
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A test that can be performed on either side of the heart, cardiac catheterization checks for different functions in both the left and right sides.
for circulation of blood
In the same sense that humans have two hearts, yes they do. We have a left heart and a right heart. Yes, they are next to each other. They have related but not identical functions.
It is called the interventricular septum.
An earthworm does not have a heart. But, it possess an organ called an aortic arch that performs similar functions of the heart.