Les principes de contrôle sanitaire . bed dansle sang, les organes de la respiration qui séparent l'oxygène de l'air il andgive au sang et éliminer le dioxyde de carbone dans le sang et putit dans l'air, les organes de circulation (coeur, artères, veines, et capil-laries) qui empêchent le sang en mouvement dans tout le corps et l'aide dans themovements de la lymphe, et les organes d'élimination (les reins, le foie, la peau, les poumons et le gros intestin) dont le travail est d'enlever du corps thecell déchets. Ils sont appelés les organes vitaux, parce que la vie ne peut pas être carriedon sans eux. Ils maintiennent li

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The principles of health control . bed intothe blood, the organs of respiration which separate oxygen from the air andgive it over to the blood and remove carbon dioxide from the blood and putit into the air, the organs of circulation (heart, arteries, veins, and capil-laries) which keep the blood in motion throughout the body and aid in themovements of the lymph, and the organs of elimination (the kidneys, liver, skin, lungs, and large intestine) whose work is to remove from the body thecell waste. They are called the vital organs because life cannot be carriedon without them. They maintain life, however, through the work they dofor the cells. i6 PRINCIPLES OF HEALTH CONTROL clothing and bedding, the house in which one lives, toolsfor work and weapons for defense, mild climatic conditions, and environment. How Health Control is Exercised. — Since this topicis considered in all its phases in the chapters that follow, only the briefest statement need be made here. Control The activities of the cellsare subject to control. The entire cell group, or body, in its adjustments to environment is subject to control Fig. i. — Diagrammatic Representation of the general fact that health, a condition of the cells, is a controllable condition. as far as the health agencies are concerned is obtainedthrough their proper manipulation or management. It is forus to control the health agencies while they in turn producethe desired effects upon the cells. Some of the more im-portant ways by which this is accomplished are as follows:i. By controlling and regulating the entrance of mate- THE BASIS FOR CONTROL 17 rials at the mouth and the nose. By this means we cancontrol the amount and the kinds of materials going tothe cells. 2. By so administering appropriate agencies that wastesare rapidly removed from the body. 3. By a proper regulation of the bodily activities thatare under voluntary control and by supplying conditions, such as outdoor life, that stimulate those that are not underv

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