Tetrapod probably had a three-chambered heart, as do modern amphibians and reptiles, in which oxygenated blood from the lungs and de-oxygenated blood from the respiring tissues enters by separate atria, and is directed via a spiral valve to the appropriate vessel — aorta for oxygenated blood and pulmonary vein for deoxygenated blood. The spiral valve is essential to keeping the mixing of the two types of blood to a minimum, enabling the animal to have higher metabolic rates, and be more active than otherwise. The difference in density between air and water causes smells (certain chemical compounds detectable by chemoreceptors) to
The Blood That Moves the Body The Blood That Moves the Body "The Blood That Moves the Body" is a song by the Norwegian band A-ha, and was originally released in 1988 as the second single from the band's third album "Stay on These Roads". This song was re-released on with the remixes by Alan Tarney. The video remained unchanged. The dark, enigmatic lyrics of this song have been attributed to many things, including teen suicides in Japan and literary references to "Eyes of a Blue Dog". The "Two-Time Gun Remix" was later included on A-ha's 2010 compilation album, "25", which features all of the bands