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.
1 High blood pressure causes scarred arteries that fill up with plaque and become more prone to blood clots. 2  Sometimes plaque or a blood clot can completely close an artery, blocking the blood flow to tissue on the other side. 3  Damaged arteries cause blood supply failures. HBP causes damaged and blocked arteries. 2  A heart attack is the result of a blocked blood supply to the heart muscle tissue. 3  This can happen when the arteries to the heart become thicker and harder from a buildup of plaque.