Contracted heart muscle fibre and capillary, SEM

Contracted heart muscle fibre and capillary, SEM

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Credit: DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY

Caption: Contracted heart muscle fibre with a small capillary passing near the muscle fibre, scanning electron micrograph (SEM). Numerous capillaries course through the heart muscle. Capillaries are the small blood vessels (including lymph vessels) that make up the microcirculation of the human body. Their endothelial linings are only one cell layer thick. These microvessels, measuring around 5 to 10 micrometres in diameter. They connect arterioles and venules, and assist the exchange of water, oxygen, carbon dioxide, and many other nutrients and waste substances between the blood and the tissues surrounding them. Capillaries do not function on their own, but instead in a capillary bed, an interweaving network of capillaries supplying organs and tissues. Magnification: x1,000 when shortest axis printed at 25 millimetres.

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Keywords: 20590d, black and white, blood, blood capillary, capillary, cardiac muscle, cardiac muscle cell, cardiac muscle cells, cardiac muscle fibre, cardiac muscle fibres, circulatory system, contracted muscle, heart, heart muscle, heart muscle cell, heart muscle cells, heart muscle fibre, heart muscle fibres, human, human body, human capillary, human heart, monochrome, muscle, muscle fibre, muscle fibres, muscles, scanning electron micrograph, sem, ventricle

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