the oxygen dissociation curve of haemoglobin shifts to the right when there is?

Answer 1

Many factors influence the affinity of the binding of oxygen molecules with incoming molecules, and alter the shape of the curve. A left shift of the curve is a sign of haemoglobin's increased affinity for oxygen (eg. at the lungs). Similarly, a right shift shows decreased affinity, as would appear with an increase in body temperature, hydrogen ion, 2,3-diphosphoglycerate or carbon dioxide concentration (the Bohr effect).

Right shift:
temperature--high
DPG--high
p(CO2)--high
p(CO)--low
pH (Bohr effect)--low (acidosis)
type of hemoglobin--adult hemoglobin

Left shift:
temperature--low
DPG--low
p(CO2)--low
p(CO)--high
pH (Bohr effect)--high (alkalosis)
type of hemoglobin--fetal hemoglobin

The Bohr Effect (for instance) plays an important role in the oxygen-hemoglobin dissociation curve. Carbon Dioxide diffuses into alveoli when the blood passes through the lungs, this results in a decrease in the blood pCO2 and also decreases hydrogen ion concentration (due to the decrease in blood carbonic acid). This shifts the dissociation curve to the left. The amount of oxygen that binds with hemoglobin at any given alveolar PO2 increases and provides for greater O2 transport to the tissues. When the blood reaches tissue capillaries, CO2 enters the blood and shifts the curve to the RIGHT, thus displacing oxygen from hemoglobin and oxygen delivery occurs at a higher PO2.

Answer 2

Well, you never completed your question. If you read the section of your biology/biochem text which talks about the oxygen dissociation curves, you'll find several different factors which will shift the curve to the right or to the left.

Answer 3

when oxygen concentration is high