منابع مشابه
Optimal lamellar arrangement in fish gills.
Fish respire through gills, which have evolved to extract aqueous oxygen. Fish gills consist of filaments with well-ordered lamellar structures, which play a role in maximizing oxygen diffusion. It is interesting that when we anatomically observe the gills of various fish species, gill interlamellar distances (d) vary little among them, despite large variations in body mass (Mb). Noting that th...
متن کاملLamellar Bodies, an Unusual Arrangement of the Granular Endoplasmic Reticulum
In his investigation of the fine structure of the nervous system, Fernf indez-Mor~n observed lamellar structures in the Purkinje cells of the ra t cerebel lum (1). ~Ihe use of newer methods of prepara t ion fail to demonst ra te these bodies in the cytoplasm of neurons (6, 3). Dur ing the course of a study of the normal Purkinje cell in rats (3), we observed lamellar bodies in two of the ten an...
متن کاملContractile filamentous material in the pillar cells of fish gills.
The secondary lamellae of the gill filaments are the sites of gas exchange in fish gills. They are mainly composed of 2 epithelial sheets joined together by pillar cells. These cells are characterized by collagen columns contained in infoldings of the cell membrane and oriented perpendicular to the epithelial sheets. The gill is the first organ to which the blood flows from the heart and within...
متن کاملThe dimensions of fish gills in relation to their function.
It is known from the extensive measurements of Gray (1954) that the gills of marine fishes of the Atlantic Coast of North America show a wide variation in the extent of their gill area. This is true whether the area is based on the unit of body surface area or on a unit of body weight. Little data are available, however, for fishes from European waters (Byczkowska-Smyk,* 1957, 1958, 1959)The pr...
متن کاملOptimal hash arrangement of tentacles in jellyfish
At first glance, the trailing tentacles of a jellyfish appear to be randomly arranged. However, close examination of medusae has revealed that the arrangement and developmental order of the tentacles obey a mathematical rule. Here, we show that medusa jellyfish adopt the best strategy to achieve the most uniform distribution of a variable number of tentacles. The observed order of tentacles is ...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2014
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.1403621111