Question

1. explain why muscles do not use oxygen to produce energy during anaerobic exercise.

Explanation:

Anaerobic exercise is high - intensity and short - term. The body's oxygen supply can't meet the energy demand quickly. So, muscles use anaerobic respiration (like lactic acid fermentation in humans) which doesn't need oxygen to produce energy rapidly.

Answer:

During anaerobic exercise, the intensity is high and duration is short. The body's oxygen delivery system (lungs, heart, blood vessels) cannot supply oxygen to the muscles fast enough to meet the energy requirements through aerobic respiration (which requires oxygen). So, muscles switch to anaerobic metabolic pathways (such as lactic acid fermentation in human muscle cells) that do not rely on oxygen to produce ATP (energy) quickly.