The mitral valve is on the left side of the heart. It lets blood flow from the upper to the lower heart chamber. Mitral valve regurgitation is diagnosed when the mitral valve in the heart does not close well, which causes blood to leak back from the left ventricle into the left atrium. Mitral valve regurgitation forces the heart to work harder to pump extra blood out of the heart.
Measurement of a track. The proper length for a competitive running track is 400 m (1,312.3 ft). Some tracks are not built to this specification, instead some are legacy to imperial distances like 440 yd (402.3 m). Prior to rule changes in 1979, distances in Imperial units were still used in the United States.
An American football field is 160' x 360' including end zones. This is 53.33 yds x 120 yds. 1 yard = .9144 meters, so an American football field is 48.768m x 109.728m. The total size in square meters is 48.768x109.728 = 5,351.215 sq m. A Canadian football field is 195'x450' including end zones.This is 65 yds x 150 yds.n American football field is 160' x 360' including end zones. This is 53.33 yds x 120 yds. 1 yard = .9144 meters, so an American football field is 48.768m x 109.728m. The total size in square meters is 48.768x109.728 = 5,351.215 sq m. A Canadian football field is 195'x450' including end zones. This is 65 yds x 150 yds.