After establishing basic anatomical relationships in the circulatory system of the pink abalone, Halwtis corrugata, blood-pressure measurements were made in the ventricle, aorta, left epipodial artery, afferent ctenidial veins, efferent ctenidial veins, and the pericardial chamber with strain-gauge manometers on unrestrained specimens at 15°C. AU sites showed pulsatile pressures of low magnitude. Intraventricular pressure normally ranged from slightly above ambient during diastole to about 8 cm water at systole, and produced a mean pressure gradient of 5.5 cm water between the aorta and the efferent ctenidial veins. Pressure variations and pulse waves recorded from structures within the pericardium support a constant-volume mechanism for cardiac filling. There is no clear evidence that body movement enhanced venous return.
In the pink abalone, Haliotis corrugata, pulsatile flow and pulsatile pressure were measured at 15°C by electromagnetic and Doppler ultrasonic flowmeters and strain gauge manometers. Flow was pulsatile in all areas of the arterial system investigated, i.e., the aorta, the cephalic arterial sinus and pedal arteries. How rates of approximately 2.9 ml/min were measured in the aorta of animals after surgical implantation of electromagnetic flowprobes.
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