. Ein text-Buch im allgemeinen Physiologie und Anatomie. Physiologie, Vergleichende; Anatomie. 302 BEWEGUNG IK niedere Tiere. Das Boot ist gebunden. In einem solchen Fall, das Ergebnis ist, dass das Wasser und das Boot nicht, bewegt wird. In vielen der niederen Tieren den Verdauungstrakt Hohlräume werden mit solchen ciliated Zellen gesäumt, so dass sich die Ströme von Wasser, das Sie erstellen das Essen verursachen, schwimmend im Wasser, innerhalb der Reichweite durch die Strömungen gebracht zu werden. In unseren Körpern, die Mauern, die die Bronchien line sind mit solchen ciliated Zellen ausgekleidet, und hier dienen sie der Oberfläche der Membran von Staubteilchen w frei

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. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. 302 MOVEMENT IK LOWER ANIMALS. the boat is tied. In such case, the result is that the water, and not the boat, is moved. In many of the lower animals the digestive cavities are lined with such ciliated cells, and so the currents of water which they create cause the food, floating in the water, to be brought within reach by the currents set up. In our bodies, the walls that line the bronchial tubes are lined with such ciliated cells, and here they serve to free the surface of the membrane from particles of dust which might produce harm if they were allowed to remain. In fact, it is only in the case of the protozoans and a few of the young stages of the lower animals that cilia are used to move the body of the animal itself. In all other forms their function is the setting up of currents or the removal of particles. Cilia and flagella are to be con- sidered, then, as merely a modified portion of protoplasm in which the power of rhythmic contraction and expan- sion has been specially developed. They are chiefly interesting, therefore, as indicating the manner in which protoplasm can become developed into a motile organ. Muscular movement.— Muscle cells differ from ordinary cells in that they contain certain modifications of pro- toplasm called fibrillse. These fibrilla; are thin threadlike fibers embedded in the fluid protoplasm of the cell, and may be variously arranged as to direction, but are always par- allel to one another. In certain instances these fibrillsB are divided into segments by cross lines or strise, and these Fig. 135 — Ciliated epl- tlielial cells liulug the bronchial tubes; a, basal membrane ; 6, spherical epithelial cells; c, cili- ated cells ; rf, cilia.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the origin

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• bookcentury1900
• bookdecade1900
• bookpublishe
• booksubjectanatomy