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.
Heart attack (myocardial infarction (MI), is the leading cause of death among Americans. It often results from coronary artery disease, the most common form of heart disease to affect adults. See your doctor immediately if you feel pressure or a squeezing sensation in your chest, neck, jaw, shoulders, back or arms, especially if itâs accompanied by sweating, nausea, vomiting, or shortness of breath.