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.
One of the hallmarks of heart failure is when people hold on to too much fluid. When they hold on to too much fluid it begins to backup and literally stretch the heart. That extra stretch causes the cells of the heart to excrete BNP and that can be measured in the blood.