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"At the outset you should have a brief working knowledge of such things as your heart and lungs, your pancreas, liver, big and little intestines and their juices; and I shall, accordingly, give you a brief idea of the various systems, beginning today with the circulatory and respiratory.
This explains how physical exercise increases the breathing, since the muscles at work consume more oxygen than when resting and give more carbon dioxide and other wastes to the blood. The respiratory center is also connected by afferent nerves with the mucous membrane of the air passages.
This heat means vital force, and is, in no small degree, a measure of the comparative value of the so-called respiratory foods. * If we examine the fats, the starches and the sugars, we can trace and estimate the processes by which they evolve heat and are changed into vital force, and can weigh the capacities of different foods.
But they are no more inconsistent than the accounts of the growth of a human being would be, if given by two anatomists, of whom one had examined only the skeleton and the other only the respiratory system; and who, therefore, supposed the first, that the animal had been made only to leap, and the other only to sing.
Anatomy shows that the heart is joined to the lungs through the auricles, which are continued into the interiors of the lungs; also that all the viscera of the entire body are joined through ligaments to the chamber of the breast; and so joined that when the lungs respire, each and all things, in general and in particular, partake of the respiratory motion.
The body as a whole and certain parts in particular are saturated with the drug poison and correspondingly weakened. Homeopathic materia medica teaches that ~Bryonia~ has a special affinity for the mucous and serous membranes of the respiratory tract and that its symptomatic effects correspond closely to those described in the preceding paragraph.
To accomplish the digestion and absorption of this food material, the alimentary tract throughout, and particularly the stomach is greatly increased in size. With increased bulk of muscle and increased quantity of food we have increased oxidation in the tissues. This requires increased respiration, which demand is satisfied by rapid development of the respiratory system.
The Inspiratory Force.—When the thoracic cavity is enlarged in breathing, the unbalanced atmospheric pressure is exerted from all directions towards the thoracic space. It will be noted that both of the large lymph ducts terminate where their contents may be influenced by the respiratory movements.
In order that the products of excitation may be quickly and completely consumed, the powerful group of expiratory muscles must have some resistance against which they can exert themselves strongly and at the same time provide for adequate respiratory exchange.
Harry Campbell in his "Respiratory Exercises in the Treatment of Disease," "no more air, or at all events only a small quantity, can be inhaled by means of the diaphragm." This, however, should be construed as meaning that, after the diaphragm has performed its correct function in inspiration, any further violent effort on its part is practically futile.
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