الفهرس 
Invertebrate heartOnly 14 pages are availabe for public view
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Abstract
The present work aimed at a histological, histochemical and quantitative study of hearts of different animal species to show how they are structurally and metabolically adpted to the enivronments where the seasonal live environmental cinditions on the myocardia of these hearts and their adapter energetic metablic reasponses. Three groups of animals were used in this work. Each of these groups was representing a different animal class of vertebrata. These groups were as follow: 50 males of catfishes were used in this study. This group belongs to the class of fish of vertebrata.