Transport Of Gases
Mediumbiology
Identify the correct statement with reference to transport of respiratory gases by blood.
Select the correct option:
Solution
Incorrect! Answer:
Carbon dioxide is mainly transported as bicarbonate
- Transport as Bicarbonate (70%): The majority of CO2 is transported as bicarbonate ions (HCO3−). Inside RBCs, carbonic anhydrase converts CO2 and water into carbonic acid, which dissociates into HCO3− and H+.
- Transport as Carbamino-haemoglobin (20-25%): About a quarter of CO2 binds directly to the amine groups of haemoglobin.
- Transport in Dissolved State (7%): A small fraction is carried dissolved in the plasma.
- Conclusion: The statement that CO2 is mainly transported as bicarbonate is correct.
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About This Question
- Subject
- biology
- Chapter
- breathing and exchange of gases
- Topic
- transport of gases
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Carbon dioxide is mainly transported as bicarbonate
- Transport as Bicarbonate (70%): The majority of CO2 is transported as bicarbonate ions (HCO3−). Inside RBCs, carbonic anhydrase converts CO2 and water into carbonic acid, which dissociates into HCO3− and H+.
- Transport as Carbamino-haemoglobin (20-25%): About a quarter of CO2 binds directly to the amine groups of haemoglobin.
- Transport in Dissolved State (7%): A small fraction is carried dissolved in the plasma.
- Conclusion: The statement that CO2 is mainly transported as bicarbonate is correct.
This medium difficulty biology question is from the chapter breathing and exchange of gases, covering the topic of transport of gases. It appeared in the 2025 exam.
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