human heart
In fact, a person does not even have two "hearts", but four. For convenience, people called them chambers: right atrium, right ventricle, left atrium and left ventricle. All these four parts are connected together and form a single organ HEART.
It is also worth noting that parts of our heart form two independent blood circuits. Large, begins in the left ventricle, passes through all of our organs and returns to the right atrium. Small, begins in the right ventricle, then through our lungs and returns to the left atrium. Two of these blood circuits are connected through the heart, forming together a single system of blood circulation rights.
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