Question

1. explain how carb - loading might allow cells to produce more atp during a marathon.
2. some marathon runners eat energy gels (food label shown in figure 3) during a marathon

Explanation:

Carb - loading increases glycogen stores in muscles and the liver. During a marathon, when energy is needed, glycogen is broken down into glucose. Glucose is then used in cellular respiration (glycolysis, Krebs cycle, and oxidative phosphorylation). More glucose availability from increased glycogen stores means more substrate for these energy - producing pathways, allowing cells to produce more ATP.

Answer:

Carb - loading increases glycogen stores which are broken down to glucose for cellular respiration, providing more substrate for ATP production during a marathon.