Left ventricle pumps oxygenated blood out through aorta and to the rest of the body. The right ventricle will pump deoxygenated blood to the pulmonary artery to get oxygenated in the lungs. Then the...
The short explanation is that when the left ventricle doesn't pump efficiently, the right ventricle can end up being continually "overfilled," stretching that area to the point that it doesn't pump...
I do not know if you looked in an encyclopedia it should have it though not sure.. also try things like discovery health, science text books.....things like that