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Studies on the mechanism of the opening and closing movement of bivalves II. On the iso-elongative line of fibres of adductor muscles



Studies on the mechanism of the opening and closing movement of bivalves II. On the iso-elongative line of fibres of adductor muscles



Sci Bull Fac Agric Kyushu Univ 12(2): 165-175



The author measured the elongation of the fibers of adductor muscles when the shell was opened to a certain angle. From a diagram of the iso-elongative line, it was found that the fibers of adductor muscles were oriented in a regular fashion. Since the smooth muscle is nearer the edge of the shell, the elongation of its fibers is greater than that of the striated muscle. Thus the smooth muscle, with its function of strongly closing the shell, was activated to oppose the opening force of the ligament via its high susceptibility to the opening tension. The fibers of the striated muscle, nearer the center of the shell, had smaller elongation and could quickly close the shell by comparatively little contraction. From the fact that the border line between the 2 components of the adductor muscle corresponded to one of the iso-elongative lines, it could be recognized that, on opening and closing, the fibers of these component muscles strictly conformed to their function.

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