Question

if a runner is doing vigorous exercise, which results from the anaerobic cellular process?
○ accumulation of lactic acid
○ accumulation of oxygen
○ depletion of ethanol
○ depletion of carbon dioxide

Explanation:

During vigorous exercise, when oxygen supply is insufficient, cells undergo anaerobic respiration (in muscle cells, lactic acid fermentation). This process produces lactic acid. Oxygen accumulation doesn't happen in anaerobic conditions (anaerobic means without oxygen). Ethanol is a product of alcoholic fermentation (not in muscle cells during exercise), and carbon dioxide is produced in aerobic and some anaerobic processes but not depleted; in fact, more CO₂ is produced overall. So the result of anaerobic cellular process here is accumulation of lactic acid.

Answer:

accumulation of lactic acid