Osse J W
Department of Experimental Animal Morphology and Cell Biology, Agricultural University, Wageningen, The Netherlands.
Acta Morphol Neerl Scand. 1989;27(1-2):111-8.
The animal body is composed of structural elements which can be characterized by their size, position, external form, internal structure and their participation in functions. Their presence is taken for granted. The ontogenetic sequence of development of functional systems in fish shows an early absence of gills although effective and fast suction feeding movements are already found in 6 mm larvae. Calculations of the oxygen diffusion boundary layer in these larvae which would be present when oro buccal ventilation would occur show that no effective gill respiration is possible. The early absence and later development and use of gills for gas exchange reflects the changing demands of functions.
动物体由一些结构成分组成，这些成分可通过其大小、位置、外形、内部结构以及它们在功能中的参与情况来表征。它们的存在被视为理所当然。鱼类功能系统发育的个体发生顺序表明，鳃在早期并不存在，尽管在6毫米长的幼体中已经发现了有效且快速的吸食动作。对这些幼体中口腔通气时会出现的氧扩散边界层的计算表明，不可能进行有效的鳃呼吸。鳃在早期不存在，后来发育并用于气体交换，这反映了功能需求的变化。
