is the "building up" phase of metabolism, consisting of biosynthetic pathways that construct complex macromolecules from smaller, simpler units. This process is endergonic , meaning it requires an input of energy (typically ATP) and reducing power (often NADPH) to proceed. It is essential for growth, tissue repair, and energy storage, acting as the constructive counterpart to catabolism. Core Mechanism and Stages
: The body identifies or generates building blocks, such as amino acids or isoprenoids. anabolism
: These precursors are activated into reactive forms, a step fueled by the consumption of ATP. is the "building up" phase of metabolism, consisting