Question

during sarahs steady - paced running with adequate oxygen supply, what is happening in her muscle cells? select one of four cells break down glucose using oxygen to produce atp, carbon dioxide, and water active transport processes shut down completely to save energy for muscle contraction cells break down glucose without oxygen to conserve the available oxygen supply muscle cells produce lactic acid because oxygen supply is inadequate for energy needs remaining attempts: 1

Explanation:

To solve this, we analyze each option:

• Option 1: In aerobic conditions (adequate oxygen), muscle cells perform cellular respiration, breaking down glucose with oxygen to produce ATP, CO₂, and H₂O. This matches the scenario.
• Option 2: Active transport doesn't shut down; muscle contraction needs energy, so active transport (for ion movement, etc.) is still needed. Eliminate.
• Option 3: Breaking down glucose without oxygen is anaerobic respiration, which occurs when oxygen is inadequate. The question states adequate oxygen, so eliminate.
• Option 4: Lactic acid production is from anaerobic respiration (oxygen inadequacy). The scenario has adequate oxygen, so eliminate.

Answer:

Cells break down glucose using oxygen to produce ATP, carbon dioxide, and water