Coloured TEM of healthy heart (cardiac) muscle

Coloured TEM of healthy heart (cardiac) muscle

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Credit: DR GOPAL MURTI/SCIENCE PHOTO LIBRARY

Caption: Heart muscle. Coloured transmission electron micrograph (TEM) of a longitudinal section through healthy heart (cardiac) muscle. Large mitochondria (green) lie between the muscle fibres (red). The thick transverse bands on the fibres are Z lines, regions with a more dense arrangement of actin, one of the two types of muscle filament. In order to beat, the heart produces regular electrical impulses causing the muscle filaments to slide over one another and contract the cardiac muscle. The high concentration of mitochondria reflects the large respirational demands of the heart. Magnification: x5000 at 35mm size.

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Keywords: actin, anatomy, cardiac, cardiac muscle, heart, heart muscle, human body, mitochondria, muscle, muscle fibre, muscles, z line

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