Most chemical reactions in the body take place in the cells, specifically within the cytoplasm and organelles such as the mitochondria, endoplasmic reticulum, and Golgi apparatus.
The cytoplasm is the gel-like substance within cells where various reactions occur, including glycolysis, the process that breaks down glucose for energy. Mitochondria are known as the powerhouses of the cell, where the Krebs cycle and oxidative phosphorylation happen to produce ATP, the energy currency of the cell.
Additionally, the endoplasmic reticulum plays a crucial role in synthesizing proteins and lipids, while the Golgi apparatus is involved in modifying and packaging these molecules. Each of these locations is essential for the numerous biochemical pathways that sustain life.