Actin filaments have binding sites for myosin heads, normally blocked by tropomyosin in a relaxed muscle. During contraction, myosin heads bind to actin, forming actin-myosin cross-bridges, and flex to slide actin filaments along.
Los filamentos de actina tienen sitios de unión para las cabezas de miosina, normalmente bloqueados por la tropomiosina en un músculo relajado. Durante la contracción, las cabezas de miosina se unen a la actina, formando puentes de actina-miosina, y se flexionan para deslizar los filamentos de actina.
| Front | skeletal muscles muscle fibres, sarcolemma, sarcoplasm, mito and SPR |
|---|---|
| Back | skeletal muscles made up of many muscle fibres surrounded by sarcolemma (plasma membrane), cyto is sarcoplasm muscle fibres have lots of mito for ATP for contraction, SPR contains Ca2+ for contraction |
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