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.
A heart attack is a circulation problem, said Goldberg. When circulation is blocked or cut off in some way and blood is no longer supplied to the heart muscle, this can damage that muscle, she explained. Blockages causing heart attacks are mostly caused by a buildup of plaque in the arteries.