The oxygen haemoglobin dissociation curve will show a right shift in case of:

1. high pCO2

2. high pO2

3. low pCO2

4. less H+ concentration

(a) A sigmoid curve obtained when percentage saturation of haemoglobin with oxygen is lpotted against the p oxygen.
The oxygen haemoglobin dissociation curve is shifted to right under following condition.
(1)  Decrease in partial pressure of oxygen.
(2)  Increase in partial pressure of carbonoxides.
(3)  Increase in hydrogen concentration.
(4) Decrease in pH activity.
(5)  Increase body temperature.