Why does the animal die immediately when the medulla oblongata is damaged?

The thing is that it is in the medulla oblongata that the main centers of regulation of vascular tone and the respiratory system are located. Therefore, during thrombosis (blockage of blood vessels), nutrients and air do not enter this area. Death of an animal or a person is observed. It is almost impossible to prevent this process, because it passes too quickly and resuscitation actions are powerless here.

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