Abstract
WORK on this subject was carried out some years ago, on nearly three hundred intact individuals and heart preparations, the latter consisting of heart, pericardium and dorsal body-wall of the thoracic region. The heart-rate of an average (10 mm.) individual at summer temperature was 180–200 per min., but heart-beat was interrupted for short periods, for example, at the onset of a burst of locomotor activity. Dissection of the preparation always slowed and sometimes arrested the beat for periods up to 30 min. On recovery, the beat was regular and incessant, often at the maximal normal rate.
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NEEDHAM, A. Physiology of the Heart of Asellus aquaticus L.. Nature 173, 272 (1954). https://doi.org/10.1038/173272a0
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DOI: https://doi.org/10.1038/173272a0
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