The Heart of the Icefish - Bioconstruction and Adaptation
The Channichthyidae or ''icefish'' represent an intriguing example of extreme adaptation to the stable low temperature and high oxygen content of the Antarctic waters. The lack of respiratory pigments (hemoglobin and myoglobin) in these teleosts is associated with relatively low...
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ftunivnapoliiris:oai:www.iris.unina.it:11588/499633 2024-09-09T19:04:27+00:00 The Heart of the Icefish - Bioconstruction and Adaptation G. ZUMMO R. ACIERNO B. TOTA AGNISOLA, CLAUDIO G., Zummo R., Acierno Agnisola, Claudio B., Tota 1995 STAMPA http://hdl.handle.net/11588/499633 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:A1995TJ26600020 volume:28 firstpage:1265 lastpage:1276 numberofpages:11 journal:BRAZILIAN JOURNAL OF MEDICAL AND BIOLOGICAL RESEARCH http://hdl.handle.net/11588/499633 info:eu-repo/semantics/article 1995 ftunivnapoliiris 2024-06-17T15:19:29Z The Channichthyidae or ''icefish'' represent an intriguing example of extreme adaptation to the stable low temperature and high oxygen content of the Antarctic waters. The lack of respiratory pigments (hemoglobin and myoglobin) in these teleosts is associated with relatively low oxygen consumption and relevant. cardio-circulatory adjustments which include large blood volume, increased relative heart weight (cardiomegaly), and very high cardiac output. The heart has the ability to displace large systolic volumes at a low rate and relatively low pressure, with large ventricular fillings (high ventricular compliance), whereas it is incapable effacing increased afterloads. These functional aspects of mechanical flexibility and restrictions of the cardiac pump have been tentatively related to some constructional aspects of the icefish cardiomegaly, particularly, at the whole ventricular level, to the trabeculate type of myo-architecture, and, at the subcellular level, to the conflict in space economy between the exceptionally high mitochondrial densities and the consequent severe reduction in myofibrillar volume. On the basis of this morphodynamic approach, we suggest that the icefish may illustrate how a certain feature (i.e., an architectural cardiac design) common to the suborder and to most teleosts, and apparently with ''irrelevant'' properties, can become useful for a specialized purpose (i.e., volume pump design); and how, in contrast, the internal machinery construction. because of structural and ultrastructural constraints, may pre;ent these stenothermal sedentary teleosts from conquering niches requiring more active locomotory habits. Article in Journal/Newspaper Antarc* Antarctic Icefish IRIS Università degli Studi di Napoli Federico II Antarctic The Antarctic |
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Open Polar |
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IRIS Università degli Studi di Napoli Federico II |
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ftunivnapoliiris |
language |
English |
description |
The Channichthyidae or ''icefish'' represent an intriguing example of extreme adaptation to the stable low temperature and high oxygen content of the Antarctic waters. The lack of respiratory pigments (hemoglobin and myoglobin) in these teleosts is associated with relatively low oxygen consumption and relevant. cardio-circulatory adjustments which include large blood volume, increased relative heart weight (cardiomegaly), and very high cardiac output. The heart has the ability to displace large systolic volumes at a low rate and relatively low pressure, with large ventricular fillings (high ventricular compliance), whereas it is incapable effacing increased afterloads. These functional aspects of mechanical flexibility and restrictions of the cardiac pump have been tentatively related to some constructional aspects of the icefish cardiomegaly, particularly, at the whole ventricular level, to the trabeculate type of myo-architecture, and, at the subcellular level, to the conflict in space economy between the exceptionally high mitochondrial densities and the consequent severe reduction in myofibrillar volume. On the basis of this morphodynamic approach, we suggest that the icefish may illustrate how a certain feature (i.e., an architectural cardiac design) common to the suborder and to most teleosts, and apparently with ''irrelevant'' properties, can become useful for a specialized purpose (i.e., volume pump design); and how, in contrast, the internal machinery construction. because of structural and ultrastructural constraints, may pre;ent these stenothermal sedentary teleosts from conquering niches requiring more active locomotory habits. |
author2 |
G., Zummo R., Acierno Agnisola, Claudio B., Tota |
format |
Article in Journal/Newspaper |
author |
G. ZUMMO R. ACIERNO B. TOTA AGNISOLA, CLAUDIO |
spellingShingle |
G. ZUMMO R. ACIERNO B. TOTA AGNISOLA, CLAUDIO The Heart of the Icefish - Bioconstruction and Adaptation |
author_facet |
G. ZUMMO R. ACIERNO B. TOTA AGNISOLA, CLAUDIO |
author_sort |
G. ZUMMO |
title |
The Heart of the Icefish - Bioconstruction and Adaptation |
title_short |
The Heart of the Icefish - Bioconstruction and Adaptation |
title_full |
The Heart of the Icefish - Bioconstruction and Adaptation |
title_fullStr |
The Heart of the Icefish - Bioconstruction and Adaptation |
title_full_unstemmed |
The Heart of the Icefish - Bioconstruction and Adaptation |
title_sort |
heart of the icefish - bioconstruction and adaptation |
publishDate |
1995 |
url |
http://hdl.handle.net/11588/499633 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Icefish |
genre_facet |
Antarc* Antarctic Icefish |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:A1995TJ26600020 volume:28 firstpage:1265 lastpage:1276 numberofpages:11 journal:BRAZILIAN JOURNAL OF MEDICAL AND BIOLOGICAL RESEARCH http://hdl.handle.net/11588/499633 |
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1809818462361485312 |