Unit 4 - Biology - Muscles 0.0 / 5 ? Applied ScienceMusclesBTEC NationalAQA Created by: Hannah Marie WilliamsonCreated on: 05-06-19 21:29 Describe how actin and myosin filaments in a myofibril work together to cause muscle contraction. The myosin heads attach themselves to the actin binding sites. The myosin pulls the actin towards the centre of the sarcomere. Changes shape. 1 of 5 Explain how Dantrolene (medication used for MS) prevents muscle spasms. Calcium blocks binding sites on actin filaments, no calcium, tropomyosin remains unchanged. Myosin heads cannot bind to actin. 2 of 5 Test Test 3 of 5 Test Test 4 of 5 Test Test 5 of 5
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