Question

The 100 meter dash is a quick and short run requiring explosive speed. On completion of the dash the runners will continue to breathe hard for several seconds to minutes even though they are no longer running. Which of the following is the best explanation for why this is so?

A) Slow oxidative fibers are recruited last and have only started to work at completion of the run.
B) Since the exercise was mostly aerobic exercise, the runners' bodies have not yet realized the run is over.
C) The runners' use of stored oxygen, glucose and creatine phosphate is being replenished and this requires a prolonged increase of oxygen intake.
D) The runners' fast oxidative muscles are so slow to utilize oxygen it only begins aerobic respiration by the time the run has finished

Answer 1

Answer: option C (the runner's use of stored

oxygen,glucose, and creatine phosphate is being replenish and this requires a prolonged increase of oxygen intake) best explains the statement above.

Explanation: Exercise is a physical activity that requires the contraction of the skeletal muscles which in turn results in an increase of energy demand for the muscle activities. High production of ATP(Adenosine Triphosphate) is required and this is the major source of energy for the muscles. ATP can be generated from aerobic metabolic pathways that oxidise both carbohydrates and fat. 100 metres race is a quick exercise that requires increased oxygen uptake. Aerobic process supplies the majority of energy required by the contracting muscles. The runner continues to breath in oxygen even after the race to replenish the energy used up in the muscles tissues and to prevent muscle fatigue. I hope this helps. Thanks