. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. CONNECTIVE TISSUE 41 squamous form, while a section of the intestine Uning (see Ex. XXV.) illustrates the columnar or cylindrical forms. Sometimes the cells are modified in various ways. For example, in the skin, hair, and teeth the external cells become hard or horny, while the cells that line the breath- ing passages may develop hairlike projections of proto- plasm called cilia. These cilia wave back and forth and thus free the surface of tiny particles of dust, etc. In secretory epithelium the secreting cells
. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. CONNECTIVE TISSUE 41 squamous form, while a section of the intestine Uning (see Ex. XXV.) illustrates the columnar or cylindrical forms. Sometimes the cells are modified in various ways. For example, in the skin, hair, and teeth the external cells become hard or horny, while the cells that line the breath- ing passages may develop hairlike projections of proto- plasm called cilia. These cilia wave back and forth and thus free the surface of tiny particles of dust, etc. In secretory epithelium the secreting cells are often goblet shaped. Connective tissue. — If we attempt to pull apart a piece of beef we find that it resists this action by means of an in- tricate interlacing of white fibers that hold the separate parts together. These fibers make up what is called intermuscular tissue, which, in turn, is a form of connective tissue. These fibers are not cells, but are formed in the matter thrown off by certain cells. They are of two kinds, white inelastic, and yellow elastic, fibers, and their function is to surround and connect other layers. Hence the name, connective. It is evi- dent then that the connecting is done by the substance given off by cells and not by cells themselves. This characteristic holds true of all forms of connective tissue. The cells are small and of importance only as makers of the connective part which is called inter-. Oorpuscle Bundle of White Fibers Fig. 12—Intermuscular connect- ive tissue. Corpuscles are the cells which form the 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 original Eddy, Walter Hollis, b. 1877. New York, Cincinnati [etc. ] American book Co
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