Which substance causes muscles to ache during strenuous exercise?

Question

Quizplus · Accepted Answer

Lactic acid is produced in muscles during strenuous exercise when there is not enough oxygen available for energy production. The accumulation of lactic acid causes the muscles to ache. While pyruvic acid and lactose dehydrogenase are involved in energy production, they do not directly contribute to muscle fatigue. Lactate ion is a by-product of lactic acid, but it is not the primary cause of muscle soreness.

Which Substance Causes Muscles to Ache During Strenuous Exercise