Answer:
Organ
Explanation:
Organ of circulation. Other organs are the blood vessels - arteries, veins and capillaries
The heart is an example of an organ level of organisation in an organism. So the correct option is B
The heart is the controller of the human cardiovascular system. It is analogous to a pump as it applies pressure to cause the flow of blood in blood vessels.
The human heart is the size of a fist. It has four chambers. It is made of specialized muscular tissue called cardiac muscles. These are not found anywhere else in the body.
The human heart is made of three walls. The endocardium is the inner wall, the myocardium is the middle layer and the epicardium is the outer protective layer.
The human heart has four chambers in which the bottom two chambers are called ventricles and the upper two chambers are called the atrium. These a divided in the middle by a septum.
The blood vessels associated with the heart are called great vessels. These are superior and inferior vena cava, pulmonary vein, pulmonary artery and aorta.
Thus the heart is an organ ensuring the proper functioning of the cardiovascular system.
Therefore the correct option is B.
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