Muscle fibres consist of many muscle cells fused together. As well as sharing nuclei, muscle fibres share ___________, which contains many mitochondria. Each fibre is made up of myofibrils which contain 2 types of protein; _________ which is thinner and __________ which is thicker.
Define the term antagonistic muscle action.
Figure 1 shows a myofibril strand in a relaxed muscle fibre.
Figure 1
Describe the effect of muscle fibre contraction on the length of the A-band and the sarcomere.
Explain the presence of a large number of mitochondria in the sarcoplasm of a muscle fibre.
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