Types of channel Dchemical-gated channel 化学门控通道) Voltage-gated channel (电压门控通道) 3mechanical -gated channel) (机械门控通道)
Types of channel ①chemical-gated channel (化学门控通道) ②Voltage-gated channel (电压门控通道) ③mechanical – gated channel) (机械门控通道)
Membrane channels ONa Open Closed © 0 FIGURE 3-14 Membrane channels.Gated channel proteins form tunnels through which specific molecules may pass-as long as the "gates"are open.Notice that the transported molecules move from an area of high concentration to an area of low concentration
Extracellular fluid Cytosol Uniporter Symporter Antiporter Facilitated transport Coupled transport
carrier mediated diffusion 膜外 载体蛋白质 《“题爱逸露透类M 膜内
carrier mediated diffusion
(b)Carrier 业业 Conformational change Characteristics: ①特异性(specificity)） ②饱和性(saturation) ③竟争性(competitive inhibition)
①特异性(specificity) ②饱和性(saturation ） ③竟争性（competitive inhibition ） Characteristics: