《生物化学》课程教学课件（PPT讲稿）第九章 脂类与生物膜 第三节 生物膜的功能 4/5

MOUIE A0252601.mov 神经

神经

Presynaptic neuron Action potential arrives at synapse,causes release of acetylcholine 300 vesicles/ms 50nm gap Large inward current of Na+ Depolarization Acetylcholine receptor 囊泡分泌 Acetylcholine binds 专一性通道 to receptor;ion Na channel opens 信号传递 Nat influx through receptor channel depolarizes membrane;nerve impulse has been transmitted across synapse Postsynaptic neuron

300 vesicles/ms 50nm gap Large inward current of Na+ Depolarization 囊泡分泌 专一性通道 信号传递

294 Part ll PROTEINS Synaptic side 乙酰胆碱受体 02βXδ Cytosolic side

乙酰胆碱受体 2

9k的 A0269301.mov P3信号

IP3信号