Answer:
Step-by-step explanation:
Most of lactic acid is made by muscle tissue and red blood cells. When the oxygen level in the body is normal, carbohydrate breaks down into water and carbon dioxide. When the oxygen level is low, carbohydrate breaks down for energy and makes lactic acid. Muscle cells convert glucose or glycogen to lactic acid. The lactic acid is absorbed and converted to fuel by mitochondria in muscle cells. However, research shows that lactate accumulation may assist to relieve the burn or muscle cramp created during high-intensity physical activity.
Muscles make it deliberately, producing it from glucose, and they burn it to obtain energy. The reason trained athletes can perform so hard and so long is because their intense training causes their muscles to adapt so they more readily and efficiently absorb lactic acid.
By training at a high intensity (lactate threshold training) it is thought that the body creates additional proteins that help absorb and convert lactic acid to energy.