Arizona State University (ASU) BIO360 Animal Physiology Exam 1 Practice

Storing energy as glycogen offers the significant advantage of rapid mobilization when the body needs energy quickly. Glycogen is a polysaccharide that can be broken down into glucose rapidly through glycogenolysis, providing a swift source of glucose for energy, especially important during high-intensity exercise or stress. This quick availability of energy is crucial for maintaining performance and metabolic functions in situations where immediate energy is required.

While lipids do contain more energy per unit mass, they require more time to break down and mobilize for use compared to glycogen. This slower process makes lipids less efficient for quick energy demands, even though they are a more energy-dense form of storage.

Additionally, glycogen's storage form, being in a readily accessible state, does not prevent physical functions of the cell in the same way that excessive lipid storage could. However, the primary reason glycogen is favored for quick energy needs is its rapid mobilization capability, which is the essence of being able to access energy quickly and efficiently when necessary.