请输入您要查询的字词:

 

单词 rod
释义
rod

Physics
  • A type of light-sensitive receptor cell present in the retinas of vertebrates. Rods contain the pigment rhodopsin and are essential for vision in dim light. Compare cone.


Mathematics
  • An object considered as being 1-dimensional, having length and density but having no width or thickness. It is used in a mathematical model to represent a thin straight object in the real world. It may be rigid or flexible, uniform or not, depending on the circumstances.


Biology
  • A type of light-sensitive receptor cell present in the retinas of vertebrates. Rods contain the pigment rhodopsin and are essential for vision in dim light. Each consists of a narrow cylindrical outer segment, which detects light; an inner segment containing mitochondria; a cell body containing the nucleus; and a terminal synaptic body, which transmits signals to an adjacent neuron. The rhodopsin molecules are organized within a stack of membranous discs in the outer segment. Rods are not evenly distributed on the retina, being absent in the fovea and occupying all of the retinal margin. See also dark adaptation. Compare cone.


随便看

 

科学参考收录了60776条科技类词条,基本涵盖了常见科技类参考文献及英语词汇的翻译,是科学学习和研究的有利工具。

 

Copyright © 2000-2023 Sciref.net All Rights Reserved
京ICP备2021023879号 更新时间:2024/12/26 1:06:37