Muscles 2.0 / 5 based on 1 rating ? BiologyHuman, animal and plant physiologyA2/A-levelAQA Created by: RosieCreated on: 31-05-13 12:25 Myofibril tiny muscle fibres that group together to make larger muscle fibres 1 of 11 Sarcoplasm the shared cytoplasm of all the fused muscle cells in a muscle fibre 2 of 11 Actin thin, double stranded protein filament 3 of 11 Myosin thick, rod shaped protein filament, with bulbous heads that project to the side 4 of 11 A-Band dark band on a myofibril, actin and myosin overlap in this band 5 of 11 I- Band light band on myofibril, contains only actin 6 of 11 H-Zone light coloured region at centre of A-band, contains only myosin 7 of 11 Z-line found at centre of I-band, marks end of sarcomere and begining of next 8 of 11 Sarcomere the distance between two z-lines 9 of 11 Tropomyosin forms fibrous strand around actin filament 10 of 11 Troponim globular protein involved in muscle contraction 11 of 11
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