Question

during an intense soccer game, a player starts to feel burning and soreness in their leg muscles even though they are still breathing hard. what is the main biological reason for this muscle soreness? image of lactic acid fermentation and alcohol fermentation pathways
options:

• lactic acid buildup from anaerobic respiration in the muscles
• excess carbon dioxide in the blood from breathing hard
• protein breakdown in the muscles
• lack of oxygen causing aerobic respiration to stop completely

Explanation:

To solve this, we analyze each option:

• Option 1: During intense exercise, muscles may not get enough oxygen, so they use anaerobic respiration (lactic acid fermentation), producing lactic acid. This buildup causes soreness, matching the scenario.
• Option 2: Excess CO₂ from breathing hard doesn't cause muscle soreness; CO₂ is exhaled, so this is incorrect.
• Option 3: Muscle soreness from exercise isn't mainly due to protein breakdown; it's related to energy metabolism, so this is wrong.
• Option 4: Aerobic respiration doesn't stop completely; muscles switch to anaerobic but still do some aerobic, so this is incorrect.

Answer:

A. Lactic acid buildup from anaerobic respiration in the muscles