FURTHER STUDIES ON STREAMLINE BLOOD FLOW IN THE ARTERIES OF THE CAT

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Abstract
Observation of the movement of particles of ink in a glass tube inserted into the lower abdominal aorta of the cat shows that the flow is streamlined under the conditions of the expts. Broemser''s finding of a retrograde movement of the blood during a brief portion of the cardiac cycle is confirmed. Measurement of the distribution of injected ink in various arteries by the use of a Coleman spectrophotometer shows that ink injected into the root of the aorta near the aortic orifice, or into the descending thoracic aorta, may be unequally distributed to tributary arteries. These findings are consistent with earlier evidence for laminar flow in the aorta. The importance of recognizing the dynamical pattern of the blood flow in studies on the circulation is emphasized. Certain criticisms of an earlier paper by the present authors are discussed.

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