This study guide focuses on the fundamental principles of chemistry and biochemistry in the human body, with a special emphasis on human energy metabolism. The introductory section describes the chemical composition of the body, as well as the structure and function of biogenic elements, water, carbohydrates, lipids, proteins, and enzymes. The second section covers metabolic and energy pathways, including glycolysis, lipid and protein metabolism, the Krebs cycle, oxidative phosphorylation, protein biosynthesis, and the role of vitamins in human health.