| Autor: |
Feinstein, R., Pinsker, H., Schmale, M., Gooden, B. A. |
| Zdroj: |
Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology; January 1977, Vol. 122 Issue: 3 p311-324, 14p |
| Abstrakt: |
Heart rate was chronically monitored (Figs. 1, 3) in two species of the marine gastropodAplysia. The warm waterA. brasiliana have an average basal heart rate in water of 33 min-1, whereas the cold waterA. californica's heart rate is 20.6 min-1. The heart rate in both species shows a strong temperature dependence and the difference in basal heart rate is negligible when measured at the same temperature (Fig. 2). Both species show a consistent bradycardia when exposed to air (Fig. 4):A. brasiliana showed a 43% average decrease in air, whereasA. californica showed only a 16.5% decrease. Removal of the abdominal ganglion produced no significant decrease in heart rate in either species, nor did it reduce the bradycardial response to air exposure inA. californica (Fig. 8). However, it significantly reduced, but did not abolish, the bradycardia inA. brasiliana (Figs. 5, 6, 7). We conclude that the bradycardia has a significant central component inA. brasiliana, but is peripherally mediated inA. californica. The bradycardial response to air exposure may be analogous to the diving response in air breathing vertebrates. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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