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Figure 2


Fig. 2. Electron micrographs of cross sections of SMR (A) and CMP (B) circular muscle fibres to illustrate differences in the cells. Note the large core of mitochondria (M) in the SMR fibres and the more extensive sarcoplasmic reticulum (arrows) in the CMP fibres. Scale bars, 2 µm (A); 1 µm (B). (C,D) Electron micrographs of longitudinal sections of the SMR (C) and CMP (D) circular muscle fibres. Scale bar for C and D, 0.5 µm. Note the longer thick filaments (arrows) in the SMR fibre.