Human Metabolism Pathway Diagram - From Macronutrients to ATP Production #1404436 (License: Personal Use)

The image illustrates the interconnected biochemical pathways by which the body metabolizes proteins (into amino acids and urea), carbohydrates (via glucose to glycogen or pyruvate), and lipids (into fatty acids and glycerol) to produce acetyl-CoA, fueling the citric acid cycle and ultimately generating ATP through oxidative phosphorylation. Key processes include gluconeogenesis, glycogenesis, lipogenesis, and the urea cycle for nitrogen disposal. Arrows indicate reaction directions and metabolic fluxes between intermediates like pyruvic acid, glucose-6-phosphate, and NH₃.

Used in biology, nutrition, and medical education web pages to explain cellular respiration and metabolic integration; targets students, educators, and health professionals seeking a visual summary of human catabolism and energy production.