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Fig. 1. Survey picture of longitudinal section through shortened sarcomeres of frog leg musc\Q [in. biceps Jemoiis). 

 Magnification 92,000. 



Fig. 2. Higher magnification of longitudinal section through shortened sarcomere of /;;. biceps fenwiis of frog. Notice 

 the thick A-band part of the myofilaments with irregular outlines, interconnecting cross-bridges, and the transversal 

 orientation of more opaque regions within the myofilaments. Magnification < 160,000. 



Fig. 3. Longitudinal section through stretched muscle fiber with elongated sarcomeres. Notice the difference in diameter 

 of the myofilaments as compared to fig. 2. Magnitlcation 160,000. 



