1.1 is a micrograph of part of some fish gills.magnification ×110Fig.1.1Fish gills are adapted for gas exchange by diffusion.(i) Define the tem diffusion.2](ii) Suggest one adaptation, visible in Fig. 1.1, that shows that fish gills are efficient structures for gas exchange by diffusion....
Data from across disciplines strongly supports a stem vertebrate origin for gas exchange structures and function at the gills with the emergence of larger, more active fishes. However, the recent discovery of putative ionocytes in extant cephalochordates and hemichordates suggests that ion regulation...
How are fish gills adapted for gas exchange? What are some examples of jawless fish? How do marine organisms float? How did dolphins get dorsal fins? Do amoebas reproduce by budding? How do paramecium and amoeba feed? What is the function of a fish's operculum?
4.6Environmental adaptation The Northern snakehead, an economically importantfreshwater fishnative to East Asia, can breathe air with gills and migrate short distances over land. Thegenome sequencingof the Northern snakehead identified several essential genes in theangiogenesispathway (related to gas exchang...
Another particularity of these cells, the extensive network of tubules, extension of the basolateral plasma membrane, is shown to be made of repetitive units. We discuss the functional importance of the observations with respect to the adaptation of fish to different salinities. 展开 关键词:...
A very small and select group of pelagic fishes (i.e., tunas, billfishes Istiophoridae, and lamnid sharks Lamnidae) have evolved the capacity for cranial endothermy, which allows for elevation of brain and eye temperatures (see section Regional Endothermy). This unique adaptation significantly ...
The surface epithelium of teleostean fish gills. Cellular and junctional adaptations of the chloride cell in relation to salt adaptation Various species of teleostean fishes were adapted to fresh or salt water and their gill surface epithelium was examined using several techniques of electro... Sardet...
Finally, with the gills fully submerged in the in-situ anaesthesia group, branchial respiratory gas exchange is maintained (which is impossible when fish are in air) preventing depletion of blood oxygen and further accumulation of CO2 (and potentially lactate if blood O2 declines sufficiently to ...
Thus they are ideal material for ontogeneticalstudies.Although the respiratory mechanisms of adult fish havebeen the subject of a great deal of investigation from thepoint of view of gas exchange (see Randall 1970) gillstructure (Hughes, 1966; Hughes & Grimstone, 1965; Newstead,1967; to name ...
Fish - Gills, Lungs, Swim Bladder: Most fishes exchange dissolved oxygen and carbon dioxide in water using gills which lie behind and to the side of the mouth cavity. The circulatory system consists of the heart, arteries, capillaries, and veins. The hea