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
Effects of tightlacing on the body many complications while the body is tightlaced, becoming severed due to the location of the ribs as a result of the tightlacing, and that the liver would become enlarged or displaced. Another possibility was mechanical congestion, the result of the pressure placed on the inferior vena cava, thus obstructing the flow of blood. According to Dr. Tse-Ling Fong, liver cancer is often the result of this vein being blocked. The blocked vein is not able to filter out the bad blood in the liver resulting in a cancerous infection. However, corsets would not have had a drastic effect on the