. The anatomy and physiology of the human body. Containing the anatomy of the bones, muscles, and joints; and the heart and arteries . B * Haller, loc. cit. Bsper. 424, OF THE SMALL INTESTINES. 225 The portion of the intestine included under A contracts andsends its contents into B. B contracting sends its fluid contentsin part backward into A, but in a greater proportion into the contents of the middle portion are sent into thelower part in a greater proportion than into the higher divi-sion, the tendency of the food will he in its natural course,downward ; whilst at the same time it
. The anatomy and physiology of the human body. Containing the anatomy of the bones, muscles, and joints; and the heart and arteries . B * Haller, loc. cit. Bsper. 424, OF THE SMALL INTESTINES. 225 The portion of the intestine included under A contracts andsends its contents into B. B contracting sends its fluid contentsin part backward into A, but in a greater proportion into the contents of the middle portion are sent into thelower part in a greater proportion than into the higher divi-sion, the tendency of the food will he in its natural course,downward ; whilst at the same time it suffers an alternatemotion backward and forward ; so that it is more extensivelyapplied to the absorbing surface of the intestines. The stimulus to the intestines is matter applied to their innercoat: and although there is much sympathy in the wholecanal, yet unless there be matter within a portion of thecanal, that particular part has little action. Accordingly, whenthere is obstruction to the course of the aliment, by whatevercause it may be produced, the portion below becomes shrunkand pale, and free from the effects of infla
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