Interaction & Interdependence C.2 Cell Respiration (id: beb81e71a)

本题目来源于试卷: Interaction & Interdependence C.2 Cell Respiration，类别为 IB生物学

[单选题]
The graph below shows the changes in the woi0hu e0.0kh levels of lactate on the skin of at:q3 0ii/ zx 7l(midpsdhletes during pre-training (rest), trainid0p(lim z/id37: xs qing, and recovery.

Based on the graph, which is true?

A. There was no lactate during pre-training because there was no cellular respiration.
B. As exercise intensity increased, anaerobic respiration increased.
C. During periods of exercise, lactate levels remained constant.
D. During the recovery periods, aerobic and anaerobic respiration continuously increased.


参考答案:  B


本题详细解析:
Choice A – A is wrong because there was approximately ;kts(acuqrw 6owh 9c bu0e9;:$0.39 mmol L^{-1}$ during rest. Choice B - During the training period, there was an increase in the intensity of exercise which required an increase in ATP synthesis. Since the ATP output of aerobic respiration was inadequate, the body also used anaerobic respiration to produce ATP. The increased rate of anaerobic respiration was evidenced by the increasing levels of lactate on the skin. Choice C – During the training period, lactate levels increased because the intensity of exercise increased. Choice D – During the recovery period, lactate levels decreased because the body was transitioning back to utilising aerobic respiration only.

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