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.
This is the side that pumps blood to the body. The heart's lower chamber, called the left ventricle, cannot pump blood as well. It's called systolic because your ventricle doesn't squeeze forcefully enough during systole, which is the phase of your heartbeat when your heart pumps blood. Tests may show a low ejection fraction. This means that your left ventricle isn't working as well as normal.