Question 2
Original source text (the original panel preserves all diagram labels, tables and choices):
During the Paris 2024 Olympics, a marathon runner is pushing her limits in the
final lap of the race. As she sprints to the finish line, her muscles are working at
maximum capacity and her body begins to experience oxygen deficiency. Due to
the shortage of oxygen in her active muscle cells, certain substance of energy
metabolism accumulate, causing a change in pH.
Which of the following options correctly identifies the nature of the pH change
and the major substance responsible for it?
pH Change Substance
A Decrease Carbon dioxide
B Decrease Lactic acid
C Increase Carbon dioxide
D Increase Lactic acid
During the Paris 2024 Olympics, a marathon runner is pushing her limits in the
final lap of the race. As she sprints to the finish line, her muscles are working at
maximum capacity and her body begins to experience oxygen deficiency. Due to
the shortage of oxygen in her active muscle cells, certain substance of energy
metabolism accumulate, causing a change in pH.
Which of the following options correctly identifies the nature of the pH change
and the major substance responsible for it?
pH Change Substance
A Decrease Carbon dioxide
B Decrease Lactic acid
C Increase Carbon dioxide
D Increase Lactic acid