. The biology of marine animals. Marine animals; Physiology, Comparative. BODY FLUIDS AND CIRCULATION 115 tension or application of NaCl, but the resulting contractions are slow, local or peristaltic, of quite a different kind from the neurogenic heart beat (1, 3, 4, 75). Electrocardiograms of the neurogenic hearts of arthropods show fast and slow components like those of myogenic hearts, but in addition a complex oscillatory pattern is present (Astacus, Libinia, Limulus) (Fig. ). The larger slow waves in the arthropod ECG correspond to processes of muscular contraction and repolarization,
. The biology of marine animals. Marine animals; Physiology, Comparative. BODY FLUIDS AND CIRCULATION 115 tension or application of NaCl, but the resulting contractions are slow, local or peristaltic, of quite a different kind from the neurogenic heart beat (1, 3, 4, 75). Electrocardiograms of the neurogenic hearts of arthropods show fast and slow components like those of myogenic hearts, but in addition a complex oscillatory pattern is present (Astacus, Libinia, Limulus) (Fig. ). The larger slow waves in the arthropod ECG correspond to processes of muscular contraction and repolarization, while the fast oscillations represent nervous discharge. Electrical recording from the isolated pacemaker ganglion of Limulus shows bursts of impulses corres- ponding to each heart beat. Each neurone discharges several times during (a). 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 Nicol, J. A. Colin (Joseph Arthur Colin), 1915-. New York, Interscience Publishers
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