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Updated: May 2, 2025
Each separate motor action presumably has its own mechanism brain pattern which is activated by but one ceptor and by that ceptor only when physical force of a certain intensity and rate of motion is applied. This is true both of the visible contacts affecting the nociceptors and of the invisible contacts by those intangible forces which affect the distance ceptors.
If the acidity is further increased, there is loss of muscular tone and even the strong contact ceptor stimuli of a surgical operation do not cause any muscular response, and, finally, the acidity may be increased to the point at which the respiratory and circulatory centers can no longer respond by increased effort, and anesthetic death that is, ACID death follows.
If pain is a part of a muscular response and occurs only as a result of contact ceptor stimulation by physical injury, infection, anemia, or obstruction, we may well inquire which part of the nerve mechanism is the site of the phenomenon of pain. Is it the nerve-ending, the nerve-trunk, or the brain?
Like the other phenomena of life, pain was undoubtedly evolved for a particular purpose surely for the good of the individual. Like fear and worry, it frequently is injurious. What then may be its purpose? We postulate that pain is a result of contact ceptor stimulation for the purpose of securing protective muscular activity.
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