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.
Other causes that limit blood flow. Other rare causes of damage or blockage to the coronary artery also limit blood flow to the heart. Sometimes, plaques burst open and release blood cells called âplateletsâ into the artery. This then cause blood clots and further buildup.