. Principes de la science vétérinaire ; un texte-livre pour une utilisation dans les écoles agricoles. La médecine vétérinaire. Le système musculaire LA PHYSIOLOGIE DES MUSCLES 59 La grande taille du système musculaire est une indication de son importance physiologique. L'essentiel la plupart des propriétés et fonctions des muscles vont maintenant être discutées. L'extensibilité et l'élasticité sont propriétés caractéristiques de tous les types de muscles. La première est la propriété d'étirage ; celui-ci la propriété de revenir à la forme initiale après étirement. Ces propriétés peuvent être mieux démontrée par l'application d'un. Fig. 14.- Courbe d'exten

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. Principles of veterinary science; a text-book for use in agricultural schools. Veterinary medicine. THE MUSCULAR SYSTEM THE PHYSIOLOGY OF MUSCLES 59 The great size of the muscular system is an indication of its physiologic importance. The most essential properties and functions of muscles will now be discussed. Extensibility and elasticity are characteristic properties of all kinds of muscle. The former is the property of stretching; the latter the property of returning to the original shape after stretch- ing. These properties can be demonstrated best by applying a. Fig. 14.- Curve of extension of a rubber band, to show the equal exten- sions for equal increments of weight. The band had an initial load of 17 gms., and this was increased by increments of 3 gms. in each of the nine extensions, the final load being 44 gms. The line joining the ends of the ordinates is a straight line, b, Curve of extension of a frog's muscle (gastrocnemius). The initial load and the increment of weight were the same as with the rubber. The curve shows a decreasing extension for equal increments. The line joining the ends of the ordinates is curved. (Howell's Physiology.) weight to living voluntary muscle, which, will extend under the strain. When the weight is removed, the muscle returns to its original form by virtue of its elasticity. The extensibility of such a muscle is great, but the elasticity, though perfect, is slight. In the living animal muscles are normally on the stretch. This is seen by cutting across the belly of a muscle when a noticeable gap occurs between the severed ends. This elastic tension insures almost instantaneous action when the muscle is brought into play for there is no slack to be taken up. The muscle stands as if it were at full cock, We have seen that muscles are arranged Digitized by Microsoft®. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of the

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