Ivan Pavlov Quotes on Digestion
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Appetite, craving for food, is a constant and powerful stimulator of the gastric glands.
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As we have seen, bread, and especially dry bread, evokes secretion of considerably larger quantities of saliva than meat.
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Edible substances evoke the secretion of thick, concentrated saliva. Why? The answer, obviously, is that this enables the mass of food to pass smoothly through the tube leading from the mouth into the stomach.
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From the described experiment it is clear that the mere act of eating, the food even not reaching the stomach, determines the stimulation of the gastric glands.
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It has long been known for sure that the sight of tasty food makes a hungry man's mouth water; also lack of appetite has always been regarded as an undesirable phenomenon, from which one might conclude that appetite is essentially linked with the process of digestion.
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Mechanical influences are completely ineffective with regard to the gastric glands.
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Physiology has, at last, gained control over the nerves which stimulate the gastric glands and the pancreas.
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Precise knowledge of what happens to the food entering the organism must be the subject of ideal physiology, the physiology of the future.
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The digestive canal represents a tube passing through the entire organism and communicating with the external world, i.e. as it were the external surface of the body, but turned inwards and thus hidden in the organism.
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The first stage through which the food substances introduced from without must pass, is the digestive canal; the first vital action on these substances, or to be more exact and objective, their first participation in life, in its process, constitutes what we call the digestion.
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With each meal, when edible substances find their way into the oral cavity, thick and viscous saliva containing much mucus flows out of these glands.