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.
Oxygen dissociation curve. the percentage of Hb. that is chemically bound to oxygen at each oxygen pressure. steep portion of curve. -shows that O2 rapidly combines with hemoglobin as the Po2 increases. -Hb is 90% saturated at PO2 of 60mmHg. -When PO2 falls below 60mmHg, sharp decrease in how much O2 binds to Hb. -small changes in PO2 <60mmHg produce big changes in O2 content and Hb saturation.