What are the MOST common sources of glucose needed for energy during exercise? glucose from blood and glycogen stored in muscles
amino acids from protein and glucose found in bones pyruvic acid from carbohydrates and fatty acids stored in adipose tissue vitamins and minerals in nutritional supplements and protein found in blood
the other options would need to be converted to glucose through metabolism, whereas the blood glucose and muscle glycogen are more readily available for use.
Glycogen is found in most cell types, however, the largest reserves are in the liver and skeletal muscle. In muscle, glycogen is used by the muscle cell itself (fiber) and is not exported to other locations. In these cases, the glycogen molecule breaks down when there is very intense activity and is used as a source of energy.
Glucose is one of the simplest carbohydrates (monosaccharide). It is from these monosaccharides, glucose, fructose and galactose that all other carbohydrates are formed. Because glucose is our body's main energy source, all carbohydrates are broken down by specific enzymes into smaller molecules. Glucose stays in the blood and provides a lot of energy for practical activities.
