What provides most of the energy that muscles use to go into action in the early minutes of an activity?

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Quizplus · Accepted Answer

Muscle glycogen is the stored form of glucose in muscles and can be quickly broken down into glucose to provide energy for muscle contractions. It is the primary source of energy for muscles during high-intensity activities that last a few minutes. Liver glycogen and fats are also used for energy during longer duration activities, while protein is not a significant energy source for muscles.

What Provides Most of the Energy That Muscles Use to Go