<prompt> Plateau oxygen dissociation curve signifiesNo oxygen is available for binding to HbNo Hb molecule is available to bind O2All oxygen is released to tissuesCarboxy-Hb formation  <response>: In its most simple form, the oxyhemoglobin dissociation curve describes the relation between the paial pressure of oxygen x axis and the oxygen saturation y axis. Hemoglobins affinity for oxygen increases as successive molecules of oxygen bind. ... The P50 is a conventional measure of hemoglobin affinity for oxygen Ref: guyton and hall textbook of medical physiology 12 edition page number:354,355,356 