The heart is a four chambered pump that forces blood around the circulatory system, also known as the cardiovascular system. Which rather makes the heart a major (and very important) organ.
The heart is a part of the cardiovascular system.
The Heart.
the heart is its own organ if you mean system it is part of the cardiovascular system.
the heart.
Cardiovascular system
heart
The cardiovascular system, which consists of the heart and lungs (cardiovascular system also includes veins and arteries).
Cardiovascular, made of cardio=heart and vascular=vessels
The heart and blood vessels are part of the cardiovascular system.
The levels or organization are: cells -->tissues--->organs--->organ systems--->organism. The heart is an organ of the organ system called the cardiovascular system. This includes the heart, veins and arteries and blood.
The circulatory system and the cardiovascular system. :D NOT jk
The cadiovascular system, sometimes called the circulatory system when it includes the lymphatic system.