An allometric analysis of oxygen consumption rate and cardiovascular function in the cockroach, Blaberus discoidalis
| Autor: | Geoffrey F. Birchard, Avril U. Arendse |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Nymph
medicine.medical_specialty Cardiac output Physiology Cockroaches Blaberus discoidalis Biology Cardiovascular System Biochemistry Cardiovascular Physiological Phenomena Oxygen Consumption Heart Rate Internal medicine biology.animal Heart rate medicine Animals Cardiac Output Molecular Biology Cockroach Oxygen transport Heart Stroke Volume Stroke volume biology.organism_classification Endocrinology Blaberus Allometry |
| Zdroj: | Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology. 129:339-344 |
| ISSN: | 1095-6433 |
| Popis: | The interrelationship of metabolic rate and cardiovascular function has been well documented in vertebrates through allometric analyses. However, similar studies are lacking in insects. Unlike vertebrates, the cardiovascular system of insects does not play a significant role in oxygen transport. A comparison of the interrelationship in insects and vertebrates might provide insight into the nature of the connection between metabolic rate and the cardiovascular system. Oxygen consumption, heart rate and heart dimensions were measured in the nymphs of the cockroach Blaberus discoidalis over a mass range of 0.03–5 g. Oxygen consumption rate scaled with an exponent of 0.83. The relationship between heart rate and body mass scaled negatively, however, it did not appear to be linear. Using measurements of heart widths, abdominal length and heart rate, stroke volume and cardiac output were estimated. Cardiac output appeared to scale linearly with an exponent of 0.85, which was not significantly different from the exponent observed for the rate of oxygen consumption. Thus, the observed similarity between the exponents for oxygen consumption rate and cardiac output in vertebrates also appears to be present in insects. |
| Databáze: | OpenAIRE |
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