Yes - It has chambers which are separated by valves and surrounded by muscles which squeeze and relax to pump blood around the body
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The heart is an organ.
Heart is an organ. It's a pumping organ which pumps the blood to the whole body. Organ means a working part of an organism (system)\ Since heart is a working part of our body, therefore it's an organ
The heart is an organ within the circulatory system. It is make up of different tissues working together to pump blood.
The skin is the largest organ, but of the two organs quoted in the question, the liver is larger than the heart.
The nervous system causes the heart to beat faster when you exercise. It itself is not an organ but a system.