The Body At Work, a Treatise On the Principles of Physiology
The book The Body At Work, a Treatise On the Principles of Physiology was written by author Alex Hill Here you can read free online of The Body At Work, a Treatise On the Principles of Physiology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Body At Work, a Treatise On the Principles of Physiology a good or bad book?
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It was the result of the slight sudden stretching. In short, the tone-mechanism has been fooled. Notice the position of the leg. The knee is semiflexed ; the foot is hanging free. There is nothing for the extensor muscles of the thigh to do. Now, if ever, they are justified in dozing. It is not to be wondered at that the sudden stretching of the ligament takes them ofE their guard, or that on waking they give a quite unreasonable start. The phenomenon is, as we asserted, easy to account for. It... would also be easy to ex- plain, if it were not for the extreme rapidity with which the jerk foUows the tap. The interval is about one-hundredth of a second. This is thought to be too short to allow an impulse to ascend a sensory nerve, pass through the cord, and descend a motor nerve. It is true that these reflexes of adjustment 18—2 Digitized by Microsoft® 276 THE BODY AT WORK must stand on a different level to other reflexes. The tone- impulses which cause them are incessantly patrolling to and fro from sense-organs to nerve-endings.
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