The Physiology of the Circulation in Plants in the Lower Animals And in Man B
The Physiology of the Circulation in Plants in the Lower Animals And in Man B
James Bell Pettigrew
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If we assign to muscles, or their sarcous elements, the power of changing form in one direction, it is unphilosophic to assume that they have not the power of changing form in another and PHYSIOLOGY OF THE CIRCULATION. opposite direction. Even structureless masses of protoplasm are endowed with this power, and the amoeba, which may be regarded as an aggregation of such masses, can elongate and shorten its body with equal facility, can contract or close in one direction and expand or open in ano...ther can make a temporary cavity in its substance to serve the pur- pose of a temporary stomach, and then obliterate it. Similar attributes inhere in the white blood corpuscle. The majority of physiologists of the present day deny that muscles are endowed with the power of elongating. They say that muscles can only contract or shorten, and that when they elongate their elongation is due to elasticity, or they are drawn out by antagonist muscles ; a flexor drawing out its extensor the one instant, the extensor drawing out the flexor the next.
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