. The biology of marine animals. Marine animals; Physiology, Comparative. i 1 mm. Fig. Cardio-regulative Nerves of the Heart of Pamdirus argus (a). Effect of stimulation of cardio-inhibitor fibres on heart beat. Frequency of stimu- lation varied (pulses per sec). (6). Effect of stimulation of cardio-accelerator fibres on heart beat. Frequency varied (pulses per sec). (From Maynard (86).) A schema has been suggested ascribing cholinergic activity to extrinsic acceleratory nerves and pacemaker (large intrinsic) neurones, and adrener- gic activity to the intrinsic (small) motor cells (30, 3
. The biology of marine animals. Marine animals; Physiology, Comparative. i 1 mm. Fig. Cardio-regulative Nerves of the Heart of Pamdirus argus (a). Effect of stimulation of cardio-inhibitor fibres on heart beat. Frequency of stimu- lation varied (pulses per sec). (6). Effect of stimulation of cardio-accelerator fibres on heart beat. Frequency varied (pulses per sec). (From Maynard (86).) A schema has been suggested ascribing cholinergic activity to extrinsic acceleratory nerves and pacemaker (large intrinsic) neurones, and adrener- gic activity to the intrinsic (small) motor cells (30, 31, 57, 75, 105, 115, 122, 133). Polychaetes. The contractile vessels of two polychaetes have been investigated, namely Nereis and Arenicola. Nerve cells have been found in the lateral hearts of Arenicola, but not in the contractile dorsal vessel of. 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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