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.
When the heart is not pumping well, it can cause a backup of blood. This backup of blood causes fluid to leak from the blood vessels into the tissues. This is called congestion.. In the lungs, congestion may lead to difficulty breathing. In the ankles and legs, the congestion or backup of fluid causes swelling.