NEET-UG Biology · Class 11
Carbon dioxide carriage in the blood — NEET & JEE Questions
Carbon dioxide carriage in the blood is a topic in Breathing and Exchange of Gases, a Class 11 Biology chapter of the NEET-UG syllabus. TestBudy holds 13 published NEET-UG questions on Carbon dioxide carriage in the blood, each with the marking scheme of the real paper. The ideas it examines include Oxygen vs carbon dioxide transport percentages, Direction of chloride movement in red blood cells, Carbonic anhydrase in tissues vs in lungs.
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- 10
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Key formulas and concepts
The ideas Carbon dioxide carriage in the blood is examined on, as they are tagged in the syllabus tree.
- Oxygen vs carbon dioxide transport percentages
- Direction of chloride movement in red blood cells
- Carbonic anhydrase in tissues vs in lungs
Carbon dioxide carriage in the blood MCQs with solutions
10 of the 13 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.
In which form is most carbon dioxide transported in human blood?
- A. Bicarbonate ions
- B. Dissolved molecular carbon dioxide
- C. Carbaminohaemoglobin only
- D. Carbon monoxide
In the systemic capillaries, bicarbonate ions diffuse out of the red blood cell. Which ion moves inward to preserve electrical neutrality?
- A. Sodium
- B. Potassium
- C. Chloride
- D. Calcium
The approximate fraction of carbon dioxide transported as bicarbonate:
- A. about 70 percent
- B. about 97 percent
- C. about 23 percent
- D. about 7 percent
The approximate fraction of carbon dioxide transported as carbaminohaemoglobin:
- A. about 1 percent
- B. about 97 percent
- C. about 20-25 percent
- D. about 70 percent
What role does carbonic anhydrase play in carbon dioxide transport?
- A. It binds oxygen to haemoglobin
- B. It rapidly catalyses the reversible conversion of carbon dioxide and water to carbonic acid
- C. It pumps bicarbonate across alveolar cells using ATP
- D. It converts carbon dioxide directly into glucose
Carbon dioxide enters a red blood cell in systemic tissues. Which sequence accounts for the major transport pathway?
- A. CO2 + haemoglobin → glucose
- B. CO2 → O2 → HCO3−
- C. CO2 + H2O → H2CO3 → H+ + HCO3−
- D. CO2 → pyruvate → bicarbonate
Most carbon dioxide transported in blood is carried in the form of
- A. bicarbonate ions
- B. dissolved CO2 only
- C. carbaminohaemoglobin only
- D. carbon monoxide
Which enzyme in red blood cells rapidly catalyses the reversible hydration of carbon dioxide?
- A. Carbonic anhydrase
- B. Pepsin
- C. Catalase
- D. Hexokinase
When bicarbonate leaves a red blood cell in systemic capillaries, which ion commonly moves into the cell to maintain electrical neutrality?
- A. Chloride
- B. Calcium
- C. Phosphate
- D. Potassium only
Why is the bicarbonate pathway well suited for transporting large amounts of carbon dioxide from tissues to lungs?
- A. It eliminates the need for carbon dioxide diffusion
- B. It permanently traps carbon dioxide inside red blood cells
- C. It requires no reversible reactions in the lungs
- D. It converts much of the carbon dioxide into a highly transportable ionic form
Common mistakes in Carbon dioxide carriage in the blood
Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.
- Remembering bicarbonate formation in tissues but not that the reaction reverses in the lungs.
- Assumes bicarbonate is the form directly exhaled through alveoli.
- Assumes oxygenation has no relation to carbon-dioxide unloading.
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