Heart valve. False-colour scanning electron micrograph of a portion of one of the atrioventricular valves of the heart: either the tricuspid or the mitral valve. They channel the flow of blood from the atria to the ventricles and prevent any backflow. The image clearly shows the chordae tendineae, the fibrous filiform collagenous cords, which connect the cusps of the valve to the papillary muscles of the heart. The epithelium at top is known as the endocardium: it is formed by a single layer of flattened cells supported by fibro-elastic connective tissue. Magnification: x70 at 6x7cm size.
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