. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. MULTICELLULAR ANLMALS 239 The beating of the vertebrate heart is effected by a harmonious contraction and relaxation of the muscle cells, the impulse traveling from cell to cell so that the order of contraction is first sinus. A B Fig. 165.—A, branch o£ the privet; B, axillary buds developing after removal of the terminal bud. venosus (or its remnant, the sino-auricular node in the mammalian heart), then the atria, and lastly the ventricles (Fig. 164). Although the rate of heart beat is under
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. MULTICELLULAR ANLMALS 239 The beating of the vertebrate heart is effected by a harmonious contraction and relaxation of the muscle cells, the impulse traveling from cell to cell so that the order of contraction is first sinus. A B Fig. 165.—A, branch o£ the privet; B, axillary buds developing after removal of the terminal bud. venosus (or its remnant, the sino-auricular node in the mammalian heart), then the atria, and lastly the ventricles (Fig. 164). Although the rate of heart beat is under control of the nerves, the beat itself does not originate by nerve stimuli. Coordinated beating occurs in. 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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