ERA. 1  baseball, baseball game - a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs; he played baseball in high school; there was a baseball game on every empty lot; there was a desire for National League ball in the area; play ball!.
The contraction of the heart muscle starts in the two atria, which push the blood into the ventricles. Then the walls of the ventricles squeeze together and force the blood out into the arteries: the aorta to the body and the pulmonary artery to the lungs.
In this Article. Dilated cardiomyopathy (DCM) is when the heart's ability to pump blood is lessened because its main pumping chamber, the left ventricle, is enlarged and weakened. In some cases, this prevents the heart from filling with blood as it should. Over time, it can affect the other chambers.