FORESTRY
GENETICS TREE IMPROVEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A marathoner’s leg muscles often feel heavy and prone to cramping after 20 or more miles. Which of the following is the best explanation for this?
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A marathoner’s muscles cells cannot store glucose for use as energy
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A marathoner’s muscle cells contract when glucose reacts with oxygen
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A marathoner’s circulatory system cannot take in sufficient oxygen, and the muscle cells must switch to anaerobic respiration for energy.
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A marathoner’s circulatory system takes in too much oxygen during a race, which causes muscle cramping
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Explanation:
Detailed explanation-1: -So, the correct answer is ‘Lactic acid’.
Detailed explanation-2: -The build-up of lactic acid due to anaerobic respiration in muscle cells when there isn’t sufficient oxygen available for aerobic respiration (which is the case during vigorous exercise) leads to fatigue and results in cramps.
Detailed explanation-3: -The accumulation of lactic acid causes muscle cramps. We get relief from cramps after a hot water bating or a massage as it improves circulation of blood due to which the supply of oxygen to the muscle cells increases.
There is 1 question to complete.