TEM of Papillary Muscle of a Heart

Numéro d’image : 12046446
TEM of Papillary Muscle of a Heart
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
Licence : Droits gérés
Crédit: Science Photo Library / Fawcett, Don W.
Taille de l’image : 3312 px × 4722 px
Model Release : Non requis
Property Release : Non requis
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