1. Tardigrade
  2. Question
  3. Biology
  4. Assertion: A rise in PCO2, H+ ions and temperature shifts the HbO2 dissociation curve to right. Reason: A rise in PCO2 or fall in pH decreases oxygen affinity for haemoglobin.

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Q. Assertion : A rise in $PCO_2$, $H^+$ ions and temperature shifts the $HbO_2$ dissociation curve to right.
Reason : A rise in $PCO_2$ or fall in pH decreases oxygen affinity for haemoglobin.

Breathing and Exchange of Gases

Solution:

A shift to the right of oxygen dissociation curve indicates dissociation of oxygen from haemoglobin. In the tissues, low $pO_2$, high $pCO_2$, high $H^+$ concentration (low $pH$ or acidity) and higher temperature favour dissociation of oxygen from the oxyhaemoglobin.