| In each myofibril are a number of sacromere, stacked end to end like carriages of a train. |
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| Transmission electron microscopy reveals similar Abands, Ibands, Zlines, and repeating sacromere units. |
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| The sacromere is composed of thin and thick filaments, proteinous filaments composed of actin and myosin, respectively. |
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| The myosin essentially walks along the actin molecule, pulling it towards the middle of the sacromere. |
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| It involves interaction between several different kinds of protein molecules, two of which are long filaments that are located within each sacromere. |
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