. The biology of marine animals. Marine animals; Physiology, Comparative. BODY FLUIDS AND CIRCULATION 93 Invertebrates. In cephalopods, which have closed circulatory systems, blood pressures are high, greater than those of many cold-blooded verte- brates. In Octopus pressures in the cephalic artery range from 48-60 mm Hg, and in one large animal reached 88 mm Hg. Differences between systolic and diastolic pressures usually lie around 10 mm Hg, but may attain 25 mm. In the gill veins blood pressures fall to 5-4-6-1 mm Hg;. Fig. Diagram of Sympathetic Pathways in a Teleost Fish a, artery; c
. The biology of marine animals. Marine animals; Physiology, Comparative. BODY FLUIDS AND CIRCULATION 93 Invertebrates. In cephalopods, which have closed circulatory systems, blood pressures are high, greater than those of many cold-blooded verte- brates. In Octopus pressures in the cephalic artery range from 48-60 mm Hg, and in one large animal reached 88 mm Hg. Differences between systolic and diastolic pressures usually lie around 10 mm Hg, but may attain 25 mm. In the gill veins blood pressures fall to 5-4-6-1 mm Hg;. Fig. Diagram of Sympathetic Pathways in a Teleost Fish a, artery; c, chromatophore; ma, mesenteric artery; mrc, mixed ramus communicans; , pre-ganglionic neurone; o, oviduct; sg, sympathetic ganglion; sb, suprarenal body; da, dorsal aorta; e, gut; pgn, post-ganglionic neurone. pulse pressure here is small, around 0-8 mm Hg. Cephalopods are the largest and most active of invertebrates, with correspondingly high metabolic levels (121). In contrast, pressures in the vessels of sluggish polychaetes are very low. In Neanthes pressure in the dorsal artery is 1-1-2-2 mm Hg when the animal is at rest, and increases to 17-6 mm Hg during activity (Zucker- kandl in Prosser) (108).. 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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