* Carbohydrates: These are the body's main source of quick energy. Examples include glucose (sugar), glycogen (stored in the liver and muscles), and starch (found in plants).
* Lipids (fats): Fats are a highly concentrated form of energy, providing more energy per gram than carbohydrates. They are stored in adipose tissue.
* Proteins: While primarily used for building and repairing tissues, proteins can also be broken down for energy when needed.
It's important to note that organisms also store smaller amounts of other energy forms:
* ATP (Adenosine triphosphate): This is the primary energy currency of cells. It's not stored in large quantities but is constantly being made and used for cellular processes.
* Potential energy: This is stored in the position of molecules within the body, like the stored energy in muscles before they contract.
So, while chemical energy is the dominant form, organisms utilize other forms of energy to a lesser extent.
