Ivan Pavlov Quotes on Biology
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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 is clear to all that the animal organism is a highly complex system consisting of an almost infinite series of parts connected both with one another and, as a total complex, with the surrounding world, with which it is in a state of equilibrium.
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Mechanical influences are completely ineffective with regard to the gastric glands.
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Our experiments not only proved the existence of a nervous apparatus in the above-mentioned glands, but also disclosed some facts clearly showing the participation of these nerves in normal activity.
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Thus, the purposeful relationship of phenomena is based on the specificity of the stimuli, that correspond to similarly specific reactions.
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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.