Caption: 3D animation of the contraction of actin (thin) filaments and a myosin (thick) filament in a sarcomere (repeating contractile unit of a myofibril) in a cardiac muscle cell. In the presence of calcium ions (white dots), chemical bonds (cross bridges) are formed between 'heads' on the myosin filaments (darker stalks in foreground) and myosin binding sites on the actin filaments. The myosin heads pull the actin filaments along the myosin filaments resulting in contraction. When the calcium has been removed (absence of white dots) the myosin heads detach, the actin filament slides back, the sarcomere extends and the cardiac muscle relaxes.

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Keywords: actin, attaching, beating, binding, ca+, ca2+, calcium, calcium ions, cardiac, cardiac cycle, cardiology, cell, cells, contractile, contracting, contraction, cross bridges, diastole, ecg, electrocardiogram, extending, extension, filament, filaments, healthy, heart, heartbeat, heartbeats, human, human biology, ion, ions, microscopic, muscle, myocardiocyte, myocardiocytes, myocyte, myocytes, myosin, myosin head, myosin heads, normal, physiological, physiology, relaxed, relaxing, sarcomere, sarcomeres, slide, slides, sliding, sliding filament theory, systole, thick filament, thin filament

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Actin Myosin contraction, animation

K003/8654 Rights Managed

Downloadable master

Duration: 00:00:51.08

Frame size: 640x480

Frame rate: 25

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 269.7M


Capture format: QuickTime Animation

Frame size: 720x486

Codec: Photo - JPEG

Interlaced: Yes

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