Etruscan shrew muscle: the consequences of being small
| العنوان: | Etruscan shrew muscle: the consequences of being small |
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| المؤلفون: | Klaus D. Jürgens |
| المصدر: | Journal of Experimental Biology. 205:2161-2166 |
| بيانات النشر: | The Company of Biologists, 2002. |
| سنة النشر: | 2002 |
| مصطلحات موضوعية: | Physiology, Isometric exercise, Aquatic Science, chemistry.chemical_compound, Isometric Contraction, biology.animal, Lactate dehydrogenase, Respiration, medicine, Animals, Citrate synthase, Suncus etruscus, Muscle, Skeletal, Molecular Biology, Ecology, Evolution, Behavior and Systematics, biology, Shrews, musculoskeletal, neural, and ocular physiology, Shrew, Anatomy, musculoskeletal system, biology.organism_classification, chemistry, Insect Science, biology.protein, Shivering, Body Constitution, Animal Science and Zoology, Creatine kinase, medicine.symptom, Energy Metabolism |
| الوصف: | SUMMARYThe skeletal muscles of the smallest mammal, the Etruscan shrew Suncus etruscus, are functionally and structurally adapted to the requirements of an enormously high energy turnover. Isometric twitch contractions of the extensor digitorum longus (EDL) and soleus muscles are shorter than in any other mammal, allowing these muscles to contract at outstandingly high frequencies. The skeletal muscles of S. etruscus contract at up to 900 min-1 for respiration, up to 780 min-1 for running and up to 3500 min-1 for shivering. All skeletal muscles investigated lack slow-twitch type I fibres and consist only of fast-twitch type IID fibres. These fibres are optimally equipped with properties enabling a high rate of almost purely oxidative metabolism: they have a small diameter,their citrate synthase activity is higher and their lactate dehydrogenase activity is lower than in the muscles of any other mammal and they have a rapid shortening velocity. Differences in isometric twitch contraction times between different muscles are, at least in part, probably due to differences in cytosolic creatine kinase activities. |
| تدمد: | 1477-9145 0022-0949 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a1ee13bffbd0861042c3a35163d6f638Test https://doi.org/10.1242/jeb.205.15.2161Test |
| رقم الانضمام: | edsair.doi.dedup.....a1ee13bffbd0861042c3a35163d6f638 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14779145 00220949 |
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