- A Carbon dioxide, dissolved directly in plasma
- B Nitrogen, an inert gas with no carrier protein
- C Oxygen (via haemoglobin)
- D Hydrogen, released during cellular respiration
Correct answer: C. Oxygen (via haemoglobin)
Explanation: RBCs contain haemoglobin which binds and transports oxygen from lungs to tissues. CO2 is also transported but mostly in plasma.
Concept context
Blood, lymph, the heart, the cardiac cycle, blood pressure, and ECG. High NEET weightage.