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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.

Ivan Pavlov

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Ivan Pavlov
Age: 87 †
Born: 1849
Born: January 1
Died: 1936
Died: January 1
Chemist
Neurologist
Physician
Physiologist
Pavlov Ivan
Ivan Petrovich Pavlov
Obviously
Concentrated
Mouths
Evoke
Secretion
Pass
Enables
Saliva
Mass
Thick
Edible
Answer
Stomach
Smoothly
Answers
Leading
Tube
Food
Substance
Substances
Mouth
Tubes

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The Sun-Paul must consider only one thing: what is the relation of this or that external reaction of the animal to the phenomena of the external world?
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Possibilities are like the wings of birds they allow man to soar and to climb to the heavens. And facts are like the atmosphere against which those wings must beat, and without which the soaring bird will surely plummet back to earth.
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Men are apt to be much more influenced by words than by the actual facts of the surrounding reality
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I am convinced that an important stage of human thought will have been reached when the physiological and the psychological, the objective and the subjective, are actually united, when the tormenting conflicts or contradictions between my consciousness and my body will have been factually resolved or discarded.
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It is not accidental that all phenomena of human life are dominated by the search for daily bread - the oldest link connecting all living things, man included, with the surrounding nature.
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Finally, as the digestive canal is a complex system, a series of separate chemical laboratories, I cut the connections between them in order to investigate the course of phenomena in each particular laboratory thus I resolved the digestive canal into several separate parts.
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While you are experimenting, do not remain content with the surface of things.
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Perfect as the wing of a bird may be, it will never enable the bird to fly if unsupported by the air. Facts are the air of science. Without them a man of science can never rise.
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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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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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The physiologist who succeeds in penetrating deeper and deeper into the digestive canal becomes convinced that it consists of a number of chemical laboratories equipped with various mechanical devices.
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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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School yourself to demureness and patience. Learn to inure yourself to drudgery in science. Learn, compare, collect the facts.
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In the case of the stomach, however, the nerves of the glandular cells were always severed when constructing an artificially isolated pouch and this, naturally, affected the normal work of the stomach.
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As was to be expected, the discovery of the nervous apparatus of the salivary glands immediately impelled physiologists to seek a similar apparatus in other glands lying deeper in the digestive canal.
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Science demands from a man all his life. If you had two lives that would not be enough for you. Be passionate in your work and in your searching.
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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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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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It goes without saying that the desire to accomplish the task with more confidence, to avoid wasting time and labour, and to spare our experimental animals as much as possible, made us strictly observe all the precautions taken by surgeons in respect to their patients.
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Perfect as the wing of a bird may be, it will never enable the bird to fly.
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