Question #a2164

1 Answer

Not tiredness, but soreness

Explanation:

Lactic Acid is a byproduct of fermentation reaction used to power our bodies when we don't have any oxygen left. So lactic acid itself doesn't provide any energy to us.

Tiredness in our muscles is a result of us lacking energy after exercising. This ties in with lactic acid though because the fermentation reactions in our bodies only produce a really small quantity of energy compared to the normal reactions. Since it takes time for oxygen to flow to the rest of the body again and start driving the electron transport chain, which gives a ton of energy, you'll feel tired for a few minutes after excercisng.

Meanwhile, lactic acid will make your muscles sore because its an acid