Cardiac muscle,SEM

Numéro d’image : 11753372
Cardiac muscle,SEM
Cardiac muscle. Coloured scanning electron micrograph (SEM) of a bundle of cardiac muscle fibrils (green) from a healthy heart. Mitochondria (round,orange) supply the muscle cells with energy. The muscle fibrils,or myofibrils,are crossed by transverse tubules (vertical lines). These tubules mark the division of the myofibrils into contractile units (sarcomeres). Connective tissue,composed mainly of collagen,is seen at the top and bottom of the image. Cardiac muscle is under subconscious control and continuously contracts to pump blood around the body without tiring. Magnification: x2000 at 10 centimetres wide
Licence : Libre de droits
Crédit: Science Photo Library / Gschmeissner, Steve
Model Release : Non requis
Property Release : Non requis
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