. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LIMULUS GILLS AS CIRCULATORY PUMPS A. Calculation of Phase Relationship between Heart and Gill Rhythms Heart Pressure ECG BCC Pressue Gill EMG 391. Phase B. Phase Histogram 60 - C IS 50 - LH Ou 40 - Heatbeats o o o MK^H • : WssA ixxxxxxi YSSSM 01 02 03 04 05 06 07 08 09 1 Phase Figure 6. Phase relationships between heart and gill rhythms. A. Actual records of BCC and heart pressures, gill EMG, and ECG. showing how the phase relationship between the two rhythms was calcu- lated. Phase is calculated by dividing the lat
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LIMULUS GILLS AS CIRCULATORY PUMPS A. Calculation of Phase Relationship between Heart and Gill Rhythms Heart Pressure ECG BCC Pressue Gill EMG 391. Phase B. Phase Histogram 60 - C IS 50 - LH Ou 40 - Heatbeats o o o MK^H • : WssA ixxxxxxi YSSSM 01 02 03 04 05 06 07 08 09 1 Phase Figure 6. Phase relationships between heart and gill rhythms. A. Actual records of BCC and heart pressures, gill EMG, and ECG. showing how the phase relationship between the two rhythms was calcu- lated. Phase is calculated by dividing the latency (time between onset of a gill muscle burst and onset of cardiac ganglion burst) by the duration of the concurrent gill interburst interval (time between the begin- ning of one burst and the beginning of the next burst). B. Histogram demonstrating phase preference of a cardiac ganglion burst (recorded as ECG) with respect to concurrent ventilatory event. The number of heartbeats from a particular phase were then totaled and a histogram constructed. Heartbeats per bin indicates number of events falling in each decile of phase ( between and ). In this experiment, there was a very strong phase preference of indicating the heartbeat was 180° out of phase with ventila- tory activity. We did not find such strong phase preference in all animals or in any single animal at all times. But. when phase preferences existed, they were usually close to likely mediated by neural rather than hemodynamic mechanisms. Discussion Circulatory systems have traditionally been divided into two types: closed systems, in which the blood is al- ways in distinct vessels separated physically from inter- cellular fluids; and open systems, with large, ill-defined cavities, in which the blood is not separated from the in- tercellular fluids. The open systems have been regarded as poorly developed and capable of generating only low pressures and low blood flow velocities. The open ci
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
