...Eriko Seo; Yoshiteru Seo ABSTRACT In bivalves and gastropods, ventricle contraction causes a negative pressure in the auricles and increases venous return from the afferent oblique vein (AOV): the constant-volume (CV) mechanism. The flow in the AOV should be a pulsative flow synchronized...

... for correspondence (e-mail: [email protected] ) 25 7 2006 © The Company of Biologists Limited 2006 2006 adrenergic regulation air-breathing fish cardiac filling mean circulatory filling pressure normoxia hypoxia venous return venous tone stroke volume Synbranchus marmoratus...

... circulatory filling pressure venous return A primary function of the cardiovascular system is to provide adequate blood flow to secure nutrient and oxygen transport during different behaviours and environmental conditions. It is imperative, therefore, that cardiac output, the product of heart...

...Suzanne L. Munns; Lynn K. Hartzler; Albert F. Bennett; James W. Hicks SUMMARY The effects of treadmill exercise on components of the cardiovascular(heart rate, mean arterial blood pressure, central venous pressure, venous return) and respiratory (minute ventilation, tidal volume, breathing...

... cuttlefish( Sepia officinalis L.). The anterior vena cava contracted at the same rate as the mantle, but it often expanded during mantle contraction. Furthermore, the anterior vena cava contracted peristaltically in vivo , suggesting that it actively aids venous return. The lateral venae cavae and efferent...

... increased Q̇ (by 15±1.5 and 38±6.5%, respectively), P cv (from 0.11±0.01 kPa to 0.12±0.01 and 0.16±0.02 kPa,respectively), MCFP (from 0.27±0.02 kPa to 0.31±0.02 and 0.40±0.04 kPa, respectively) and the calculated pressure gradient for venous return (Δ P v , from 0.16±0.01 kPa to 0.18±0.02 and 0.24±0.02 kPa...

...Suzanne L. Munns; Lynn K. Hartzler; Albert F. Bennett; James W. Hicks SUMMARY The effects of treadmill exercise on components of the cardiovascular(venous return, heart rate, arterial blood pressure) and respiratory systems(minute ventilation, tidal volume, breathing frequency, oxygen consumption...

... because blood flow from the caudal body and ventilation are maximal after, rather than during, exercise. Because Iguana iguana are constrained from ventilation during intense locomotion, they appear to be unable to recruit the abdomen and thorax as a pump for venous return. This constraint on simultaneous...

... correlation between the systolic level of central venous pressure and cardiac cycle duration. Cardiac filling venous return reptiles The end-diastolic volume of the cardiac ventricular lumen is the most direct determinant of ventricular power output ( Starling, 1920 ). This volume in turn depends...