Understanding Nutrition - Metabolism | The Krebs Cycle

Official Ninja Nerd Website: https://ninjanerd.org Ninja Nerds! In this metabolism lecture, Professor Zach Murphy delivers a complete and detailed breakdown of the Krebs Cycle, also known as the Citric Acid Cycle (TCA Cycle)—the central hub of aerobic metabolism where acetyl-CoA is oxidized to produce NADH, FADH₂, and GTP, which feed into the electron transport chain for ATP production. We begin by tracing the entry of acetyl-CoA into the cycle through its condensation with oxaloacetate to form citrate, followed by a step-by-step walk through the cycle’s eight enzymatic reactions. Key regulatory enzymes such as citrate synthase, isocitrate dehydrogenase, and α-ketoglutarate dehydrogenase are emphasized, along with their regulation by energy status (ATP, ADP, NADH) and substrate availability. Each step is paired with a discussion of the high-energy electron carriers it generates and how they contribute to oxidative phosphorylation. The lecture also covers important metabolic intermediates like α-ketoglutarate, succinyl-CoA, and oxaloacetate, which serve as precursors in amino acid and heme synthesis, reinforcing the cycle’s anabolic and catabolic significance. Enjoy the lecture and support us below! 🌐 Official Links Website: https://www.ninjanerd.org Podcast: https://podcast.ninjanerd.org Store: https://merch.ninjanerd.org 📱 Social Media https://www.tiktok.com/@ninjanerdlectures https://www.instagram.com/ninjanerdlectures https://www.facebook.com/ninjanerdlectures https://x.com/ninjanerdsci/ https://www.linkedin.com/company/ninja-nerd/ 💬 Join Our Community Discord: https://discord.gg/3srTG4dngW #ninjanerd #KrebsCycle #Metabolism