membranetransport修改.ppt

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membranetransport修改

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 [?zm?usis] 渗透作用 hydrophilic [,haidr?ufilik] 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 Facilitated diffusion Requires the participation of transmembrane proteins and the transported materials to be hydrophilic. Characteristics Only some simple_____ and some molecules can pass through. Requires ___ energy. It is _____________ driven (from ____ to ____ ). Also may need some ______________ proteins, such as ________________ and _____________ . Active Transport 还可以就到这里结束,然后引领大家探讨主动运输 * * Daily food we eat…… Causing the cell to shrink. Expending cell volume or bursting. irons no high low concentration transmembrane channel proteins carrier proteins * *

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