Question

a group of athletes is training for a marathon. some athletes consume a high - carbohydrate meal before training, while others consume mostly protein and fat. during the workout, the athletes who ate carbohydrates are able to sustain activity longer. which explanation best predicts why carbohydrates ensure performance in this scenario, and how might this affect their recovery afterward?
a. carbohydrates provide glucose that cells metabolize for immediate energy; after exercise, excess glucose can be stored as glycogen to help with recovery
b. carbohydrates act as catalysts for reactions in cells, which directly build muscle fibers during exercise.
c. carbohydrates are used to make proteins that repair muscles during exercise, allowing athletes to perform longer.
d. carbohydrates are not absorbed in the bloodstream, so they slow down metabolism and reduce fatigue.

Explanation:

Answer:

A. Carbohydrates provide glucose that cells break down for immediate energy; after exercise, excess glucose can be stored as glycogen to help with recovery