World of Biology on Instagram: "Muscle Contraction explained 💪 Ever wonder what powers every lift, stride, and sprint? You’re looking at actin and myosin filaments sliding within the sarcomere, the fundamental unit of muscle contraction. 🧬💪 Triggered by calcium, fueled by ATP this molecular ballet is what makes movement possible, from flexing in the gym to resuscitating in the ICU. Muscle gains start at the microscopic level. Video via @biologianonucleo #muscle #musclebuilding #musclemass #sc
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Actin is a key player in muscle contraction, forming the thin filaments within the sarcomere. These filaments are made up of G-actin units that link together to create a long, helical strand called F-actin. This helical structure gives the filament its flexibility and strength, allowing it to withstand the forces generated during muscle contraction. Each G-actin unit has a binding site for myosin, making the actin filament a track along which myosin heads can move to create muscle shortening. Th
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