Question

.Sometimes we get painful cramps in our leg muscles after running for a long time due to the accumulation of
Hydrochloric acid
Carbon dioxide
Lactic acid
Fat ​

Answer 1

Explanation:

Lactic acid .

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Answer 2

Sometimes we get painful cramps in our leg muscles after running for a long time due to the accumulation of lactic acid.

Lactic acid formation:

Lactic acid is the byproduct of the anaerobic carbohydrate metabolism called glycolysis.

Anaerobic glycolysis:

• Aerobic metabolism uses oxygen to produce energy molecules while anaerobic metabolism does not use oxygen for energy production.
• Aerobic carbohydrate metabolism provides rapid supply of energy while anaerobic carbohydrate metabolism provides slower yet huge amount of energy moleclues.
• During the lack of oxygen supply to our muscles especially during heavy physical exercise, our body activates the anaerobic metabolism to produce ATP molecules(energy molecules).