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.
stroke. A stroke is a âbrain attackâ caused by a lack of blood flow to the brain. Blood is carried from the heart to the brain in arteries or blood vessels. The brain needs a constant supply of blood. Blood flows easily through a normal, clear artery. When one of the arteries to the brain is either blocked or bursts, the brain does not get the blood it needs to function and brain cells die. There are many things that can affect blood flow. One of these is atherosclerosis. Atherosclerosis is a narrowing and hardening of the arteries. It is caused by a build-up of plaque around the walls of the arteries. If enough plaque builds up, there is less room for blood to flow through.