NEET Must-Know: Contractile Proteins Explained in 58 Seconds! Get clear on the structure of contractile proteins — Actin & Myosin — essential for muscle contraction! Actin: Thin filament 🧬; made of G-actin (globular) units polymerized into F-actin (filamentous). Regulated by tropomyosin & troponin ⚙ Myosin: Thick filament 💪; has a long tail & globular head with ATPase activity ⚡. The head binds to actin during contraction. Together, they form sarcomeres — the functional unit of muscle fibers �
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