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.
Coronary arteries: When the arteries in the heart are clogged, it is called coronary heart disease, or CHD. In this case, plaque will block or narrow the coronary arteries when the heart muscle fails to get enough blood. As a result, chest pain, known as angina will occur. It feels like pressure is squeezing your chest, but you may also feel it in your jaw, neck, arms, shoulders, or back.