ransport修改.ppt

Daily food we eat……
Membrane transportation
New Word & Expression
passive transportation 被动运输
active transportation 主动运输
free diffusion 自由扩散
facilitated diffusion 协助扩散
osmosis [ɔz'məusis] 渗透作用
hydrophilic [,haidrəu'filik] 亲水的
Classification
Passive transportation
Active transportation
Passive transportation
Passive transport consists of free diffusion and facilitated diffusion.
Free diffusion
All molecules tend to defuse down a concentration, from high to low.
All molecules diffuse through the membrane, without any energy.
Osmosis
Causing the cell to shrink.
Expending cell volume or bursting.
Facilitated diffusion
Requires the participation of transmembrane proteins and the transported materials to be hydrophilic.