An electrocardiogram (EKG or ECG) is a test that checks for problems with the electrical activity of your heart. An EKG shows the heart's electrical activity as line tracings on paper. The spikes and dips in the tracings are called waves. The heart is a muscular pump made up of four chambers .
In the official rules for Major League Baseball, it is stated that the outfield fence should be at least 250 feet from home plate. A distance of 325 feet or more along the foul lines and 400 feet or more to center field has since become mandatory for any new stadiums.
Most of the time the field is grass, but sometimes fake grass called artificial turf is used. Because the lines on the field look like a grid, the nickname for the field is the gridiron. Dimensions. The main playing area of the field is 100 yards (300 feet) long by 53 1/3 yards (160 feet) wide. End Zones. At each end of the field is an end zone. This area extends the field another 10 yards on each side. The line between the field and the end zone is the goal line. In order to score a touchdown some portion of the ball must cross the goal line in the possession of an offensive player.