Heart valve chambers are lined with endocardium. Heart valves separate the atria from the ventricles, or the ventricles from a blood vessel. Heart valves are situated around the fibrous rings of the cardiac skeleton. The valves incorporate leaflets or cusps, which are pushed open to allow blood flow and which then close together to seal and prevent backflow. The mitral valve has two cusps, whereas the others have three. There are nodules at the tips of the cusps that make the seal tighter. The pulmonary valve has left, right, and anterior cusps. The aortic valve has left, right, and posterior cusps. The
How My Heart Sings! How My Heart Sings! How My Heart Sings! is a 1964 album by jazz musician Bill Evans, recorded at the same time as "Moon Beams". It was reissued in 1992 with one bonus track. Writing for Allmusic, music critic Thom Jurek wrote of the album "This is a tough recording; it flies in the face of the conventions Evans himself has set, and yet retrains the deep, nearly profound lyricism that was the pianist's trademark." On All About Jazz C. Michael Bailey said "After the ballad-laden "Moon Beams", producer Orrin Keepnews wanted a slightly more up-tempo recording that resulted in