The heart has four chambers, left and right atrium, the left ventricle and the right ventricle.
They are separated by atrioventricular valves.
The right side- the tricuspid valve
The left side- bicuspid valve.
These valves ensure the blood flows in one direction only.
Two main arteries (away from the heart) AORTA to the body pulmonary artery to the lungs. These have semi-lunar pocket valves at their entrances.
Two main veins-vena cava from the body, pulmonary vein from lungs.
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