World of Biology on Instagram: "How do muscles contract? 💪🏼 Here’s a look inside your body as muscle fibers contract in real time — powered by calcium, ATP, and microscopic motor proteins! 🧬⚡️ From lifting weights to walking, every movement starts with this epic microscopic machinery in action. 👀 Watch actin & myosin do their thing. It’s the ultimate flex—literally. Video credit 🎥- 3DBiology (official Youtube channel) Thank you for amazing educational video 💙🙏 Link to original video👇 htt