3 Answers. In Great Britain today, the role of the queen is completely ceremonial. She (and whoever comes after her as monarch) has absolutely no actual power. In political science terms, she is the head of state for Great Britain but is not head of government.
Overview. 1  Oxygen-hemoglobin dissociation curve sigmoidal shape is characteristic of positive cooperativity binding of 1 O2 molecule to 1 subunit of deoxyhemoglobin increases affinity for O2 in adjacent subunits. P50 is PO2 at which hemoglobin is 50% saturated â P50 â â hemoglobin affinity for O2 50% saturation achieved at higher-than-normal P50.
Both the oxygenation and reduction of haemoglobin are extremely rapid reactions taking less than 0.01 seconds. The relationship between the saturation of haemoglobin and the partial pressure of oxygen in the blood is described by the oxygen dissociation curve. The curve demonstrates that at a normal PaO 2 (13kPa), haemoglobin is approaching 100% saturation.