A marathon runner who trains at altitude increases the capacity of the blood to carry oxygen. The direct benefit to respiration is
- A. more glucose stored in the blood
- B. more lactate produced per second
- C. a greater supply of the final electron acceptor to the muscles
- D. a higher concentration of ATP in the lungs
Explanation
More red cells and haemoglobin mean more oxygen reaches the electron transport chain, where oxygen is the final acceptor, so more aerobic ATP can be made. Altitude training does not raise blood glucose or ATP in the lungs.
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