. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. ^ 198 COMPAEATIVE PHYSIOLOGY. the whole being very miggeative of a galvanic battery) oloaely resembles a mtuole-nerre preparation or its equivalent in the normal body. The electric <wgans experience fatigue; have a latent period ; their dis- charge is tetanic (interrupted); is excited by mechanical, ther- mal, or electrical stimuli ; and the effectiveness of the organs is heig
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. ^ 198 COMPAEATIVE PHYSIOLOGY. the whole being very miggeative of a galvanic battery) oloaely resembles a mtuole-nerre preparation or its equivalent in the normal body. The electric <wgans experience fatigue; have a latent period ; their dis- charge is tetanic (interrupted); is excited by mechanical, ther- mal, or electrical stimuli ; and the effectiveness of the organs is heightened by elevation of temperature, and the reverse by cooling, etc. ainSOUIiAB WORK. If during a given period one of two persons raises a weight through the same height but twice as frequent- ly as the other, it is plain that he does twice the work ; from such a case we may deduce the rule for calculating work, viz., to multiply the weight and height together. The effectiveness of a given muscle must, of course, depend on the degree to which it shortens, which is from one half to three fifths of its iMigth; and tlie number of fibers it contains —i. e., upon its length and the area of its cross-section, taking into account in connection with the first factor the arrangement of the fibers; those muscles in which the fibers run longitudinal- ly being capable of the greatest total shortening. There is, as shown by actual experimental trial, a relation between the w<h^ done and the load to be lifted. With double the weight the contraction may be as great as at first, or even , greater ; but a limit is soon reached beyond whidb contraction is impossible. This principle may be stated thus: Tile controo- iixm i» a function of the ttimulua, and is illustrated by the diagram below (Fig. 183). It has been shown experimentally that the chemical inter- changes in a muscle, acting against a considerable Via. 188.—The •Iwtrlc-flth tomdo, di«Mct- ed to show electric
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1890, bookyear1890
