Energy release during muscle contraction

Videonummer 11932174
Animation of energy release during muscle contraction involving the proteins myosin (orange) and actin (green). Calcium ions (purple) bind to troponin (T). This moves tropomyosin (red) out the way and allows the myosin head to bind (flash) to the actin myofilament. ADP (adenosine diphosphate) and Pi (phosphate) are attached to the myosin head, and when the binding occurs to form cross-bridges the Pi is released. Energy stored in the head of the myosin filament (orange) is used to move the head. This causes the actin myofilament (green) to slide past the myosin myofilament. The ADP is released from the myosin as it moves. The bond between the actin and myosin head is broken when an ATP (adenosine triphosphate) molecule binds to the myosin head. The ATP is broken down to ADP and Pi, releasing energy, which is stored in the myosin head and will be used later for movement. Master same as original.
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / Biocosmos / Francis Leroy & Jana Hermanova
Modell-Rechte: nicht erforderlich
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Länge: 52 Sekunden
Seitenverhältnis: 16:9
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