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Artwork showing an anterior view of the larynx, thyroid, trachea and lungs with bronchial tree. Credit: Medical Art Service, Munich/Wellcome Images.

A transmission electron micrograph showing a longitudinal section of cardiac (heart) muscle, in which the sarcomere structure and a large intercalated disc can be seen. Credit: Professor Giorgio Gabella, Wellcome Images.

A colour-enhanced transmission electron micrograph of myofibrils in an uncontracted skeletal muscle cell (muscle fibre), showing the structure of the sarcomere with its dark and light bands between the two Z-discs. Credit: University of Edinburgh, Wellcome Images.