Elementary anatomy and physiology Elementary anatomy and physiology : for colleges, academies, and other schools . elementaryanato00hitc Year: 1869 AND PHYSIOLOGY. 137 268. Contraction commences at one End —Only a Part of the Fibrils in a State of Contraction at Once.—The contraction of a muscle does not take place in all parts of the fibers at the same time, but commences at one end, and con- tinues through in regular Fia, 152. order, as is seen in the cut 152. It is also sel- dom the case that all the fibers are contracted at once. This explains the reason why insane people « ,. . , Muscul
Elementary anatomy and physiology Elementary anatomy and physiology : for colleges, academies, and other schools . elementaryanato00hitc Year: 1869 AND PHYSIOLOGY. 137 268. Contraction commences at one End —Only a Part of the Fibrils in a State of Contraction at Once.—The contraction of a muscle does not take place in all parts of the fibers at the same time, but commences at one end, and con- tinues through in regular Fia, 152. order, as is seen in the cut 152. It is also sel- dom the case that all the fibers are contracted at once. This explains the reason why insane people « ,. . , Muscular Fiber contracting, a, Uncontracted are Olten SO prodigiously part. &, Contracted part. strong, since the whole of the muscle is made to act at once. It also shows us why we can keep a muscle contracted for a long time, as in carrying a weight for a long distance, and also why a short and violent muscular action weakens and tires us more than a protracted and more moderate one. The simple explanation is, that but a part of the fibrils are con- tracted at once, and when the nervous force is exhausted from one set of fibrils, a new set are called into action to supply their power. 269. Examples of Mnscular Strength—As examples of great muscular strength, we have given to us the history of a Samson and Goliath. And in more modern times we read of Milo of Crete who killed an ox with his fist, and then carried it more than 600 feet. He also saved the life of his fellow- scholars and teacher, Pythagoras, by supporting the falling roof until they had time to escape. Another man is men- tioned who could raise 300 pounds by the muscles of his lower jaw. This strength, however, is exhibited much more strik- ingly in another part of this chapter under the head of Com- parative Myology. 268. Do all the fibers, or even all portions of each fiber act at once in ordinary cases ? Instance insane people. 269. Give examples of great muscular strengh as illustrated by Goliah and Milo.
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