A2 Biology Unit 5 Muscles and Movement 2.0 / 5 based on 1 rating ? BiologyHuman, animal and plant physiologyA2/A-levelEdexcel Created by: JoCreated on: 06-05-13 18:22 What relaxes when the bicep contracts? tricep 1 of 10 A muscle that bends a joint when it contracts flexor 2 of 10 A muscle that straightens a joint when it contracts extensor 3 of 10 Skeletal muscle is made up of large bundles of long cells muscle fibres 4 of 10 The cell membrane of muscle fibre cells the sarcolemma 5 of 10 A muscle cells cytoplasm sarcoplasm 6 of 10 What protein are thick myofilaments made of? myosin 7 of 10 What protein are thin myofilaments made of? actin 8 of 10 Dark bands, seen in a myofibril under an electron microscope, contain... thick myosin filaments 9 of 10 Light bands, seen in a myofibril under an electron microscope, contain... thin actin filaments 10 of 10
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