heart, I have four rooms inside me. I work all the time. Im am the pump of the body. Who am I ? , right atrium, I am one of the upper chamber of the heart. I receive blood first before it goes down. I am on the right side. Who am I ?, left ventricle, I am one of the lower chambers of the heart. I pump blood with great force. I am on the left side. Who am I ?, Atria, We are two chambers on the top of the heart . We recieve blood . Who am I ?.

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