The dimensions of fish gills in relation to their function.

摘要: 1. Measurements have been made of the gill areas fourteen species British fish, all marine except for tench and trout. In addition area Antarctic icefish, Chaenocephalus (lacking haemoglobin) has measured. 2. The different parameters sieve considered quantitatively in relation to size area, resistance passage water, diffusion conditions at gills. 3. From calculations expected flow through a measured dimensions it concluded that sufficient volume would pass inter-lamellar spaces despite their fine dimensions. Differences nature relative theoretical one changes during respiratory cycle account ventilation volumes being less than those calculated. 4. analysis operation are discussed measurements Gray (1954) developmental studies Price (1931). 5. It is more active fish not only larger but gaseous exchange better sluggish forms increased such way as keep low value. This mainly achieved by having an total filament length large number secondary folds. More widely spaced higher lamellae reduced. these species. 6. Consideration given pathways along which water can infiltrate past epithelium analogies drawn with alveolar air, physiological anatomical dead-spaces mammalian lung.