Oxygen and Carbon Dioxide Carriage
- Previous year questions on Oxygen and Carbon Dioxide Carriage for NEET PG (National Eligibility cum Entrance Test - Postgraduate), from the Physiology section of the exam.
- Most questions here come from previous-year papers of Indian postgraduate medical entrance and licensing exams; where a paper and year are recorded the question carries them. The image-based questions are original vignettes written around an openly licensed figure, and were never asked in any exam.
- 18 live questions in Oxygen and Carbon Dioxide Carriage.
- 2 of 18 questions carry a verified exam year: 2018.
- Physiology is worth about 17 of 300 questions on the exam. See every subject’s weightage.
- Question set last updated 27 Aug 2026.
Q1.Which of the following decreases affinity of oxygen with hemoglobin?
- ADecreased H+ ions
- B2,3 BPG✓ Correct answer
- CDecrease in temperature
- DDecreased sorbitol
Q2.The daily production of hydrogen ions from CO2 is primarily buffered by which of the following?
- AExtracellular bicarbonate
- BRed blood cell bicarbonate
- CRed blood cell hemoglobin✓ Correct answer
- DPlasma proteins
Q3.Which of the following ranges of haemoglobin O2 saturation from systemic venous to systemic aerial blood represents a normal resting condition?
- A25 to 75%
- B40 to 75%
- C40 to 95%
- D75 to 98%✓ Correct answer
Q4.The chloride shift occurs rapidly and is essentially completes in
- A1 second✓ Correct answer
- B2 seconds
- C5 seconds
- D60 seconds
Q5.2,3 DPG binds to_____ site of Hb and____ release of O2
- AOne, increase✓ Correct answer
- BFour, increase
- COne, decrease
- DFour, decrease
Q6.The percentage of hemoglobin saturated with oxygen will increase when which of the following occurs?
- AThe aerial PCO2 is increased
- BThe hemoglobin concentration is increased
- CThe temperature is increased
- DThe aerial PO2 is increased✓ Correct answer
Q7.Shift of oxygen binding curve to the left occurs because of
- AIncreased 2,3-DPG
- BIncreased temperature
- CIncreased PCO2
- DStored blood✓ Correct answer
Q8.Decreased O2 carrying capacity and Normal PO2 is a feature of
- AAnemic hypoxia✓ Correct answer
- BHistotoxic hypoxia
- CStagnant hypoxia
- DHypoxic hypoxia
Q9.Which of the following statement is TRUE about Bohr's effect?
- ADecreased affinity of Hb to 02 is associated with decreased pH & increased C02✓ Correct answer
- BDecreased affinity of Hb to 02 is associated with increased pH & decreased C02
- CDecreased affinity of Hb to 02 is associated with decreased pH & C02
- DDecreased affinity of Hb to 02 is associated with increased pH & C02
Q10.Shift of O2 - Hb dissociation curve to the left due to
- AExercise
- BAcidosis
- CHypothermia✓ Correct answer
- DAdult hemoglobin
Answer key
Q1: B. 2,3 BPG; Q2: C. Red blood cell hemoglobin; Q3: D. 75 to 98%; Q4: A. 1 second; Q5: A. One, increase; Q6: D. The aerial PO2 is increased; Q7: D. Stored blood; Q8: A. Anemic hypoxia; Q9: A. Decreased affinity of Hb to 02 is associated with decreased pH & increased C02; Q10: C. Hypothermia.
Other topics in Physiology
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- Receptors and Intracellular Signalling
- Membrane Transport Mechanisms
- Resting and Action Membrane Potentials
- Body Fluid Compartments
- Blood Composition, Hemostasis and Blood Groups
- Nerve Conduction and Excitability
- Skeletal Muscle: Structure and Excitation-Contraction Coupling
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- Ascending Somatosensory Tracts
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