R. J. Bing, M.D.; K. Hellberg, M.D.; H. Wayland, Ph.D.
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Experiments were carried out by high-speed cinematography (400 frames per second) using transillumination of the left atrium of the cat heart. Red cell velocity in capillaries was determined by frame-to-frame analysis. Magnification on the film was 30 times. The light source was a pulsating xenon arc. Light was conducted into the atrium by a hollow glass tube through which a single optic fiber was introduced. This permitted transmission of light directly through the atrial muscle. The main observations were  presence of counter currents and asymmetric capillary arrangement,  capillary autoregulation, and  recruitment of capillaries. Counter currents were observed
Bing RJ, Hellberg K, Wayland H. Direct Observation of the Coronary Microcirculation in the Beating and Arrested Heart In Situ.. Ann Intern Med. 1972;76:861–862. doi: https://doi.org/10.7326/0003-4819-76-5-861_4
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Published: Ann Intern Med. 1972;76(5):861-862.
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