His potential energy is the food stored up in his body, particularly the glycogen in the liver and muscles.
There is a limit to the ability of the liver to change sugar into glycogen.
Fat is a form of stored food which is not so readily available for use as are glycogen and glucose.
Maltose is absorbed and assimilated, converted into glycogen.
It is also thought the glycogen thus deposited and stored up in the liver is little by little changed into sugar.
Thus we have animal starch, or glycogen, stored up in the liver.
glycogen is also stored in the muscles, where it is oxidized to release energy when the muscles are exercised.
Flesh contains no starch or sugar, but a small quantity of glycogen.
There exists also in the liver and muscles a non-nitrogenous substance, glycogen, which is detected also in other organs.
The glycogen found in yeasts is identical with that found in animal tissues.
glycogen gly·co·gen (glī'kə-jən)
A polysaccharide that is the main form of carbohydrate storage in animals and occurs mainly in liver and muscle tissue; it is readily converted to glucose. Also called animal starch.