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About the Cover
Cover:
Unlike some lizards, the American alligator (Alligator mississippiensis) does not experience limitations in venous return (QPC) during exercise due to elevated abdominal pressure. Experiments by S. L. Munns, L. K. Hartzler, A. F. Bennett and J. W. Hicks (pp. 3331-3339) demonstrated that transmural pressure of the post caval vein (PTRANS) remained positive during treadmill exercise (green symbols) despite increases in abdominal pressure. By contrast, respiratory cycle variations in abdominal pressure may act to limit venous return during exercise. Photograph by J. Crossley.
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