Summaries of Addresses of Presidents of Sections: Circulation of the Blood

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    THE control of the circulation of the blood, which is such an important problem in relation to surgical shock, forms the subject of the presidential address of Prof. R. J. S. McDowall to Section I (Physiology). Only a few years ago the subject consisted of a large amount of little-related data, but gradually this is being pieced together. For example, the well-known and dramatic fact that stimulation of the vagus nerve will slow up or even stop the heart, is now recognized as indicating part of a mechanism by which the normal heart at rest is constantly subjected to restraint, the release of which results in cardiac acceleration such as occurs in exercise.

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