our bodies fulfill the additional energy requirements during exercise.how?
Answers
Our bodies need a constant supply of energy to function properly to maintain health and internal balance. The food we eat is what provides our cells with the needed energy to survive and function properly. But before food can become a usable form of energy it has to be converted into smaller units called substrates, including carbohydrates, proteins, and fats. The energy stored in these substrate molecules is then chemically released in cells and stored in the form of a high-energy compound called adenosine triphosphate (ATP). When the chemical bonds that hold ATP together are broken, energy is released for cellular work (such as performing muscle contraction).
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The intensity of the cyclist or runner is such that oxygen gets to the mitochondria, ATP is produced and the necessary muscular contraction occurs. After two minutes of exercise, the body works to supply muscles with oxygen. In the presence of oxygen, glucose is completely broken down into carbon dioxide and water.