Lipids are the primary long-term energy storage molecule for animals.
Glycogen is the secondary long-term energy storage molecule for animals.
In what forms do animals store energy in their body?
Glycogen
- The majority of the carbohydrates in our diets are broken down by the body and turned into a sugar called glucose.
- Our cells primarily use glucose as fuel. The liver and muscles store the glucose when the body doesn't need to use it for energy.
- Glycogen is the name given to this form of glucose that is stored and is composed of several linked glucose molecules.
- Glycogen is broken down to release glucose into the bloodstream, which is then used as fuel for the cells, when the body needs a sudden surge of energy or when the body isn't obtaining glucose from food.
Lipid
- Lipids serve largely as an energy reserve, in contrast to carbs, which offer an easily accessible source of energy.
- Since the human body cannot store as much glycogen as compared lipids, the amount of energy stored as lipids is significantly more than the energy stored as glycogen.
- Lipids provide 9 kcal of energy per gram while proteins and carbs only provide 4 kcal.
- Adipose tissue, also known as depot fat, is a particular type of connective tissue that stores lipids or fats in cells all over the body.
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