Hydrogenation of Pyruvic Acid to Lactic Acid - Molecular Reaction Diagram #1783688 (License: Personal Use)

The image displays a ball-and-stick molecular model where pyruvic acid (C₃H₄O₃) on the left undergoes catalytic hydrogenation, adding two hydrogen atoms (shown as white spheres) to reduce the ketone group to a hydroxyl group, yielding lactic acid (C₃H₆O₃) on the right. Carbon atoms are black, oxygen red, and hydrogen white; the blue arrow signifies the reaction direction. This transformation is central to lactic acid fermentation in muscle cells under low-oxygen conditions.

Used in educational chemistry and biology resources-textbooks, lecture slides, or online tutorials-to explain redox reactions in metabolism, particularly glycolysis and anaerobic respiration. Matches user intent for visual learning of biochemical mechanisms.