Specifically, the oxyhemoglobin dissociation curve relates oxygen saturation (S. 2) and partial pressure of oxygen in the blood (P. 2), and is determined by what is called hemoglobin affinity for oxygen; that is, how readily hemoglobin acquires and releases oxygen molecules into the fluid that surrounds it.March 2009). The oxygenâhemoglobin dissociation curve, also called the oxyhemoglobin dissociation curve or oxygen dissociation curve (ODC), is a curve that plots the proportion of hemoglobin in its saturated (oxygen-laden) form on the vertical axis against the prevailing oxygen tension on the horizontal axis.
The Mayas believed in a world of three layers: Heaven, the middle world, and underworld. Its roots were in the underworld, its trunk in the middle world, and its branches in the highest layer of the other world.
The Maya World. The early Maya established sedentary communities in the Pacific coastal regions around 1800 BCE. By 250 CE, the Maya had developed a vibrant civilization consisting of numerous independent city-states, including the well-known ceremonial centers of Palenque, Tikal, CopÃ¡n and Calakmul. Many of these ancient sites are surrounded by contemporary Maya towns and villages that have been actively populated for several hundred, and sometimes thousands of years.