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Contribution of gular pumping to lung ventilation in monitor lizards. Postexercise thermoregulatory conduct and restoration from train in desert iguanas. Plasma catecholamine and corticosterone and their in vitro effects on lizard skeletal muscle lactate metabolism. Circulatory impairment induced by train within the lizard Iguana iguana. Farmer CG; Hicks JW Department of Ecology and Evolutionary Biology, University of California at Irvine, Irvine, CA 92697, USA. Mechanical integration of the cardiac, muscular and ventilatory pumps enables mammals to vary cardiac output over a variety to match metabolic calls for. We have discovered this integration lacking in a lizard (Iguana iguana) that differs from mammals as a result of blood circulation from the caudal physique and ventilation are maximal after, rather than throughout, exercise. Because Iguana iguana are constrained from ventilation throughout intense locomotion, they look like unable to recruit the abdomen and thorax as a pump for venous return. This constraint on simultaneous running and costal respiration arises from their musculoskeletal design, which is much like that of basal tetrapods, and so a constraint on venous return during exercise may be ancestral for tetrapods.
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