Final answer:
The short-term fuel reserve is stored as glycogen in the liver and muscles, and as fat in adipose tissues, to be used for energy when necessary.
Step-by-step explanation:
The short-term fuel reservoir is contained in cells located within the liver and muscles. After eating, if energy is not immediately required, excess glucose from food is stored as glycogen in the liver and muscle cells. The liver contains 4%-8% glycogen by weight of tissue, and skeletal muscle cells contain about 0.5%-1.0%. This glycogen can be broken down to glucose to provide energy when needed. While the dietary fats can be stored as fat in adipose tissue and used for energy via a metabolic process called B-oxidation when required.