The work of the digestive system

All manifold activities of organs of digestion constantly controls the nervous system. On the one hand, the nervous system leads mechanical processing of food, i.e., all the movements of the digestive organs, from the work of the masticatory muscles to the intestines. This activity involves a number of complex reflex mechanisms. A typical example of such reflexes is swallowing. It happens only in case if irritation occurs (lump of food, a drop of saliva , etc.,) rear palate and the base of the tongue. Irritation is transmitted to the brain, and in response fly impulses that let in the course complex, coordinated movement of the muscles of the mouth, palate, throat. If in your mouth, not a drop of saliva, i.e. if we have nothing to swallow, then swallowing it is impossible (check!).
When in the stomach gets substance, highly irritating the mucous membrane, a protective reflex vomiting. The contents of the stomach is thrown back through the mouth. There is vomiting and in some diseases of the stomach.
Driving mechanical processing of food, nervous system, on the other hand, regulates and chemical treatment it. The latter was brilliantly proved I. P. Pavlov. To his research, the scientists proved that the irritation of the branches of the vagus nerve that goes to the stomach, the secretion does not change. Based on this, came to the conclusion that the brain does not affect the main digestive glands. I. P. Pavlov proved the opposite and those made another step towards strengthening of the concept of nervism. Here is his experience. The dog fistula stomach and cut the esophagus Pavlov finds gastric branch of the vagus nerve, gears their link, each end of which prints out, and closes the wound. Now at any moment, pulling the strings, you can interrupt the nerve pathway. And here at the lecture illustrates the experience of "imaginary feeding". Dog greedy again and again swallows the same piece of meat from the stomach flows abundantly juice. The scientist comes to the animal and pulling the thread. Dog continues greedily there, but from the stomach now follows on the drop of juice. So, the work of the stomach glands manages the nervous system. Food irritates the taste buds of the tongue, they run impulses to the brain, stimulating food center. His excitement is appetite. From the centre by wandering nerve fly signals that let in the course of cancer of the stomach, pancreas, etc., and here is rule of law reflex. So, not because we feel appetite, which in the stomach appeared juice (as it was thought to Pavlov), and, on the contrary, appetite stimulation of food center - opens the Department of juice. Therefore, great importance has the taste, the smell of food, beautiful tableware - all that promotes appetite, which improves the functioning of the glands, helps to absorb food. If we are eating are outside fact, it prevents the initiation of food center, impairs digestion. First, yummy juice has, according to Pavlov, great value.
Why direct irritation of the vagus nerve has not given its predecessors Pavlov any effect? I. P. Pavlov found that this nerve are not only fiber, reinforcing the work of the glands, and fiber that constrain it. It is clear that irritation synchronously those and others could not be effective.
In addition to the influence over the receptors of the mouth, food affect cancer and through the receptors of the stomach, intestines, and also through the blood. Pavlov studied the influence of different types of food on cancer. For example, meat and vegetable broths excite cancer of the stomach, fat hinders their work, oppressing her. Became clear why fat meat - heavy food. Because the meat - product of protein, requiring the participation of pepsin, and fat inhibits cancer of the stomach. This pepsin is not allocated and all work is done by the pancreas, which the fat, on the contrary, stimulates.
Proceedings of I. P. Pavlov physiology of digestion awarded the Nobel prize.
However, the main business of his life is still ahead. One can imagine the grandeur of the brilliant scientist, if before its main achievements he was the first among physiologists planet! In the early 1900's, over the age of 50 years, a great scientist moved to learning an entirely new field, which has devoted the rest of his life. About these immortal works that became a pearl of the Russian and world science, we'll talk when we get down to the physiology of the brain.