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Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBreathing and Exchange of Gases1 Mark
MCQ
The oxygen – haemoglobin dissociation curve will show a right shift in case of:
  • A
    High pCO2.
  • B
    High pO2.
  • C
    Low pCO2.
  • D
    Less H+ concentration.
✓

Answer

  1. High pCO2 

Explanation:

The oxygen haemoglobin dissocia-tion curve is shifted either to right or left by various factors. The shift of curve to right indicates dissociation of oxygen from haemoglobin. It occurs in the following conditions:

  1. Decrease in partial pressure of oxygen.
  2. Increase in partial pressure of carbon dioxide (Bohr Effect).
  3. Increase in hydrogen ion concentration and decrease in pH (acidity).
  4. Increased body temperature.
  5. Excess of 2, 3-diphosphoglycerate (DPG).

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