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The chain gang. In gridiron football, the chain crew (commonly known as the "chain gang") is a crew that manages signal poles on one of the sidelines.There are three primary signal poles: the "rear rod" that marks the beginning of the current set of downs, the "forward rod" that marks the line to gain, and the "box" that marks the line of scrimmage.
Fractional flow reserve (FFR) is a diagnostic technique used in coronary catheterization. FFR measures pressure differences across a coronary artery stenosis (narrowing, usually due to atherosclerosis ) to determine the likelihood that the stenosis impedes oxygen delivery to the heart muscle ( myocardial ischemia ).
In American football, a touchback is a ruling that is made and signaled by an official when the ball becomes dead on or behind a team's own goal line (i.e., in their end zone) and the opposing team gave the ball the momentum, or impetus, to travel over the goal line, but did not have possession of the ball when it became dead. [1]
Collegiate and professional football games are 1 hour long, divided into four quarters of 15 minutes each. In high school football, 12-minute quarters are usually played. However, the game clock is stopped frequently, and a typical college or professional game can exceed three total hours.
In football, the formation describes how the players in a team are positioned on the field. Many variations are possible on both sides of the ball, depending on the strategy being employed. On offense, the formation must include at least seven players on the line of scrimmage , including a center to start the play by snapping the ball.
In American football, a play is a close-to-the-ground plan of action or strategy used to move the ball down the field. A play begins at either the snap from the center or at kickoff. Most commonly, plays occur at the snap during a down. These plays range from basic to very intricate. Football players keep a record of these plays in a playbook. [1]
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A play calling system in American football is the specific language and methods used to call offensive plays.. It is distinct from the play calling philosophy, which is concerned with overall strategy: whether a team favors passing or running, whether a team seeks to speed up or slow down play, what part of the field passes should target, and so on.