Licence: In copyright
Credit: On means for the prolongation of life. Source: Wellcome Collection.
Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.
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![the destruction of hostile microbes. He main- tains that these cells, useful as they are in absorbing haemorrhages and exudations, are in- strumental also in the changes of old age, that they surround the vital parts, the higher cells ot the brain and other organs, the tubules of the kidneys, &c., that they absorb them and trans- form them into connective tissue, thus pro- ducing the fibrous degeneration of organs which is one of the main changes of senility. This explanation of senile decay does not in any way militate against the view that we must endeavour by all means in our power to keep up the nutrition and functions of all organs and tissues of the body by promoting the activity of the nutritive capillaries, since the macrophages attack decaying but not healthy tissues. VI.—Action of Exercise on the Heart AND Blood-vessels. The physiological processes connected with the all-important question, the exercise of the organs^ have been studied by Ludwig and his pupils, including in this country especially Sir Lauder Brunton, and independently by Dr. George Oliver, of Harrogate [91]. During the action of an organ its arterioles become](https://iiif.wellcomecollection.org/image/b2398465x_0038.jp2/full/800%2C/0/default.jpg)