TEM of Papillary Muscle of a Heart

TEM of Papillary Muscle of a Heart

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Caption: Colour enhanced transmission electron micrograph of the papillary muscle in a cat's heart. Here one sarcomere length of two adjacent myofibrils is shown at higher magnification. The A-band is seen to be composed of a parallel array of myosin filaments 10 to 11 nm thick and about 1.5 micrometers long . The light I-band consists of actin filaments about 6 nm thick extending in either direction from the central Z-line. Actin filaments are not confined to the I-band but penetrate some distance into the A-band, occupying the interspaces between the myosin filaments. The bracket marked X indicates the region of overlap of the two sets of interdigitating filaments. The bracket marked Y indicates the central region of the A-band, where there are only myosin filaments.

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Keywords: actin, cardiac cell, cardiac tem, cardiovascular system, cat cell, cat tem, cell, colorized, enhanced, filament, heart cell, heart muscle cell, heart muscle tem, heart tem, histology, micrograph, micrography, microscopy, myofibril, myosin, papillary muscle, tem, transmission electron micrograph, transmission electron microscopy

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