. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 238 ELEMENTS OF BIOLOGY Neuroid Transmission. The phenomenon o£ excitation-trans- mission takes place in more than one type of tissue. The more famiUar and the more striking effects are those involving the nerv- ous mechanism, which is highly organized, and, so far as known, has no other function. Less familiar are the correlative influences trans- mitted by other tissues; they are less prominent but none the less impor- tant. Transmission over tissues other than nerves has been called neuroi
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 238 ELEMENTS OF BIOLOGY Neuroid Transmission. The phenomenon o£ excitation-trans- mission takes place in more than one type of tissue. The more famiUar and the more striking effects are those involving the nerv- ous mechanism, which is highly organized, and, so far as known, has no other function. Less familiar are the correlative influences trans- mitted by other tissues; they are less prominent but none the less impor- tant. Transmission over tissues other than nerves has been called neuroid TRANSMISSION. Scvcral examples will serve to illustrate its role in unifving the organism. The lining of the respiratory pas- sages of air-breathing vertebrates is composed of a layer of epithelial cells, the exposed surfaces of which are ciliated. The cilia all beat toward the nares, thus assuring an outward flow of the liquid that. Fig. 163.—Diagram showing the passage of coordinated waves o£ ciliary beat along a ciliated epi- thelial layer. P/GMT ATRIUM RIGHT VENTRICLE. 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 Buchanan, James William, 1888-. New York, London, Harper & brothers
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