Edexcel A Biology - Topic 7 (Run For Your Life) - Muscle Filament Theory 0.0 / 5 ? BiologyRun For Your LifeA2/A-levelEdexcel Created by: AGurung2Created on: 18-12-20 10:16 8734216 Across 1. The protein that is located on tropomyosin that binds to a molecule (8) 4. The molecule that binds to troponin to cause structural changes in tropomyosin to expose actin binding sites (7) 6. Within muscle fibre, composed of myosin, actin, z-line, m-line (9) 8. The membrane of the sarcomere (10) Down 1. where the calcium ions (secreted from stimulation of action potential) travels down (to then be diffused into the sarcoplasmic reticulum via calcium ion channels). (1, 6) 2. Thinner filament, moves, composed of 3 proteins (5) 3. The protein that blocks the binding sites of myosin on actin (11) 7. Thicker filament, doesn't move, composed of 1 protein binds to ATP (6)
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