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.
If you feel pressure or a squeezing in your chest, it may be angina. It can feel like a heart attack, but often it's a warning sign. The chest pain happens because there isn't enough blood flowing to part of your heart. It's a symptom of heart disease, and it's occurs when something blocks the arteries or there's a decreased blood flow in the arteries that bring oxygen-rich blood to your heart. Angina usually goes away quickly.