Coordination of activities between the auricle and ventricle in an oyster Crassostrea gigas

Hiroyuki, Uesaka; Yamagishi, Hiroshi; Ebara, Arinobu

doi:10.1016/0300-9629(87)90383-5

Cited by 5 publications

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This query is perhaps not without foundation since detailed structural evidence of the oyster heart by [6] revealed that the wall of the heart shows evidence of myocardial cells but that they are extremely scarce. Moreover, work by [12] aimed at assessing the electrophysiology of both oysters and other bivalves showed that in the Pacific oyster (C. gigas) the auricles and ventricles possess different intrinsic rates of contraction. These findings led the authors to conclude that stretch was the principal mediating factor in the coordination of auricular and ventricle contraction in the oyster heart.…”

Section: The Open Access Journal Of Science and Technologymentioning

confidence: 99%

Oyster Electrophysiology: Electrocardiogram Signal Recognition and Interpretation

Batista

Power

Harrison

2015

The Open Access Journal of Science and Technology

View full text Add to dashboard Cite

Abstract. After 100 years of published recording traces pertaining to the oyster electrocardiogram (ECG), we revisited the original experiments of Eiger (1913), using state-of-the-art electrophysiology recorders. Our aim was to confirm that a recordable ECG, similar to that of higher vertebrates, is present in the oyster heart. Portuguese oysters Crassostrea angulata, collected from the Guadiana estuary, Portugal, were used. The oysters were drilled through the right valve to reveal the pericardium. Gold and silver electrodes were placed through the hole and electrophysiological recordings were obtained. Stimulation of the oyster heart was performed in vivo and in vitro using a constant current power supply. Placement of electrodes around the heart revealed a trace that very closely matched the published ECG of Eiger (1913). However, we were unable to confirm that the recording was an ECG of the oyster heart. Moreover, measurements on isolated oyster hearts revealed a low conductivity (0.10 S m −1 ). We did, however, record a depolarization signal from what we believe to be the visceral ganglia, and this preceded contractions of the oyster heart. Our findings indicate that so-called ECGs, previously recorded by [2] in Ostrea edulis, but also the "ECG" recorded by [4] in C. virginica from oyster hearts, are in fact an artifact arising from relative movement of the recording electrodes, giving rise to a baseline shift that mimics in some ways the P and QRS features of a typical ECG. Nevertheless, such recordings provide information pertaining to heart rate and are not without importance.

show abstract

Section: The Open Access Journal Of Science and Technologymentioning

confidence: 99%

Oyster Electrophysiology: Electrocardiogram Signal Recognition and Interpretation

Batista

Power

Harrison

2015

The Open Access Journal of Science and Technology

View full text Add to dashboard Cite

show abstract

Invertebrate Circulatory Systems

McMahon

Wilkens

Smith

1997

Comprehensive Physiology

View full text Add to dashboard Cite

The sections in this article are: Protozoa and Parazoa Cnidaria Platyhelminthes Nemerteans Annelids Polychaetes and Oligochaetes Hirudinea Molluscs Heart and Vascular Performance Arthropods I: Onychophorans Arthropods II : Chelicerates Limulus Scorpions Spiders Arthropods III : Uniramia Myriapods Chilopods Insects Arthropods IV : Crustaceans Echinoderms Pogonophora Vestimentifera Hemichordates Urochordates Cephalochordates Conclusion

show abstract