Warum Blut nicht immer rot ist – Die Evolution des Blutes

There are fish whose blood is literally transparent. No hemoglobin, no red blood cells—and yet they survive in one of the world's harshest oceans. What does this tell us about the evolution of blood? This episode explores the astonishing diversity of blood chemistry: Why is our blood red, that of squid blue, and that of crocodile icefish colorless? How did hemoglobin originate—and why has it become prevalent in almost all vertebrates? What are hemerythrin and hemocyanin? And how does the body simultaneously regulate pH, oxygen supply, and CO₂ removal—down to a fraction of a pH point? The answers delve deep into the evolutionary history of vertebrates—and reveal how a simple molecule evolved into a highly complex system that makes life possible under extreme conditions. ─────────────────────────── 🔬 This episode is part of the series "Blueprint of Life" — a morphological companion series to "From Luca to Humans." You can find the complete series in the playlist:    • Bauplan des Lebens   ────────────────────────── 🌐 Transcript and Sources: https://internet-evoluzzer.de/warum-b... ━━━━━━━━━━━━━━━━━━━━━━━━━━━ 📚 MORE SERIES ON DARWINATOR: 🔬 Origin of Life:    • Ursprung des Lebens   🦴 Blueprint of Life:    • Bauplan des Lebens   🦐 Arthropods:    • Arthropoden   🦕 Evolution of Dinosaurs:    • Evolution der Dinosaurier   🦁 Mammal Dynasties: (coming soon) 🌐 More content: https://www.internet-evoluzzer.de 🌐 Partner: https://www.ag-evolutionsbiologie.de/ ━━━━━━━━━━━━━━━━━━━━━━━━━━━ 💬 Questions, corrections, comments? Feel free to leave a comment—scientific discussion is expressly encouraged. 👍 Subscribe to the channel for evolutionary biology at an academic level. ━━━━━━━━━━━━━━━━━━━━━━━━━━━ Chapters: 0:00 Intro – The Fish Without Red Blood 0:58 Antarctic Crocodile Icefish 5:12 Blood Cells – From Sponges to Vertebrates 10:47 Red Blood, Blue Blood – The Evolution of Respiratory Pigments 16:23 Outro