A marathon runner who trains at altitude increases the capacity of the blood to carry oxygen. The direct benefit to respiration is
Correct answer: C. a greater supply of the final electron acceptor to the muscles
- 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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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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