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.
Veins have no pulse-unlike arteries, there is no pump to push the blood through the venal system. Veins fight gravity to get the blood from the feet to the heart by using small and large muscular contractions that massage the veins, and push the blood along. Any small movement of the leg muscles push the blood on up.