Concept:Lactic acid accumulation from anaerobic metabolism leads to muscle fatigue.
Explanation:During intense exercise, oxygen supply to muscles becomes insufficient.
Muscles then produce energy without oxygen, a process called anaerobic metabolism.
This process generates lactic acid as a byproduct.
Lactic acid is a strong acid that dissociates into lactate and
H+ ions.
The increased
H+ concentration lowers the
pH inside muscle cells, causing acidosis.
This acidic environment interferes with muscle contraction, leading to fatigue.
Answer:Lactic acid