* Catabolism: This refers to the breakdown of complex molecules into simpler ones, releasing energy. Digestion is a catabolic process as it breaks down food into smaller molecules that can be absorbed by the body.
* Anabolism: This refers to the building up of complex molecules from simpler ones, requiring energy. Synthesis is an anabolic process as it involves the building of new molecules from smaller units.
Therefore, catabolism and anabolism are the opposite processes of digestion and synthesis, respectively.
