. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. THE CONTRACTILB TISSUES. 173 striped, coveree found ; 388 the power oeba, is a result e in a direction fulated by laws 3 the task of de- rians, connected I examples of a limplicity. 'celenterata, but ises. In many h alone forms a tion (myoblast), and is not con- muscle-cells are nt among the in- hough foimd in ind a few other rtebrates. This uly the simpler primitive
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. THE CONTRACTILB TISSUES. 173 striped, coveree found ; 388 the power oeba, is a result e in a direction fulated by laws 3 the task of de- rians, connected I examples of a limplicity. 'celenterata, but ises. In many h alone forms a tion (myoblast), and is not con- muscle-cells are nt among the in- hough foimd in ind a few other rtebrates. This uly the simpler primitive. The uscles are of the sty in articulates her invertebrate i to be some re- id the functional « better supplied ter the contrac- riped. fiber (oelZ), ed the invariable hich is perfectly auscle becoming Oiliary Morrauntl. — This subject has been already con- sidered briefly in connection with some of the lower forms of life presented for study. It is to be noted that there is a gradual replacement of this form of action by tliat of muscle as we ascend the animal scale ; it is, however, retained even in the highest animals in the discharge of functions analogous to those it fulfills in the invertebrates. Thus, ia Vorticella, we saw that the ciliary movements of the peristome CAUsed currents that carried in all sorts of parti- cles, including food. In a creature so high in the scale as the frog we find the alimentary tract ciliated ; and in man himself a portion of the respiratory tract is provided with ciliated cells concerned with assisting gaseous interahange, a matter of the highest importance to the well-being of the mammal. As be- fore indicated, ciliated cells are found in the female generative organs, where they play a part already explained. It is a matter of no little significance from au evolutionary point of view, that cil- iated cells are more widely distributed in the foetus than in the fully developed ani- mal. As would be ex- pected the movements of cilia ar
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