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.
For the Classic Period of the Mayas, the following major classes of stone sculpture may be distinguished. 1  Stelas. 2  Lintels spanning doorways, and panels and tablets set in the walls and piers of buildings and the sides of platforms. 3  Altars, rounded or rectangular, sometimes resting on three or four boulder-like legs.