During heavy exercise, we get cramps in the legs due to the accumulation of __________. [1 mark]

(a) carbon dioxide
(b) lactic acid
(c) alcohol
(d) water

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Solution

Option (b) lactic acid. (1 mark)

During heavy exercise, sufficient oxygen is not transported by the blood vessels to the muscle cells. Therefore, to meet the energy requirement, muscle cells undergo anaerobic respiration.
Anaerobic respiration results in the breakdown of glucose into energy and lactic acid. This accumulation of lactic acid in the muscle cells leads to cramp in muscles.

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During heavy exercise, we get cramps in the legs due to the accumulation of __________. [1 mark] (a) carbon dioxide (b) lactic acid (c) alcohol (d) water

During heavy exercise, we get cramps in the legs due to the accumulation of __________. [1 mark]

(a) carbon dioxide
(b) lactic acid
(c) alcohol
(d) water