Why Can't Humans Breathe Underwater?

Why can fish breathe underwater… but humans can't? Here's the strange part: water actually contains oxygen. 🌊 So why can't our lungs simply extract it? In this episode of Sketch Explained, we dive into the fascinating science behind human breathing and discover what makes our lungs completely different from fish gills. You'll learn: 🫁 How your lungs extract oxygen from air 🐟 How fish pull oxygen from water using their gills 🌊 Why water contains much less usable oxygen than air 🧠 What happens to your body when you hold your breath 🧬 Why humans evolved lungs instead of gills 🔬 Whether humans could theoretically evolve underwater breathing ⚡ And why having fish-like gills wouldn't actually be as simple as it sounds The ocean may be full of oxygen… but your body simply isn't built to collect it. Subscribe to Sketch Explained for more fascinating science, evolution, biology, and everyday mysteries explained through simple visual stories.