Heart walls of the heart to valves by cartilaginous connections called chordae tendinae. These muscles prevent the valves from falling too far back when they close. During the relaxation phase of the cardiac cycle, the papillary muscles are also relaxed and the tension on the chordae tendineae is slight. As the heart chambers contract, so do the papillary muscles. This creates tension on the chordae tendineae, helping to hold the cusps of the atrioventricular valves in place and preventing them from being blown back into the atria. Two additional semilunar valves sit at the exit of each of the ventricles. The
How Many Words How Many Words "How Many Words" is the official second single by the singer-songwriter Blake Lewis, from his debut album "A.D.D. (Audio Day Dream)". The song was expected to be followed by "Know My Name", and then "Without You". However, due to being dropped by Arista Records, "How Many Words" is the final single from his debut album. He is expected to release a single from his second album at the end of 2009. The single was released to mainstream radio format on March 10, 2008. Also, an EP featuring remixes of the song was released onto iTunes on May