2018年Cell Transport - AVC Distance …细胞运输- AVC的距离…-文档资料.ppt
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1、,The cells inner pool is called: Intracellular fluid. In a multicellular organism, the fluid outside the cell is extracellular fluid. Movement between fluid compartments are governed in part by gradients, differences in the concentration of materials in one part compared to those in another.,Two Kin
2、ds of Transport:,1. Passive (Diffusion): materials move from regions of higher concentration to regions of lower concentration, without energy expenditure by the cell. 2. Active: movement of substances against concentration gradients (from low to high), requiring the expenditure of energy by the cel
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