iv)Bidirectional propagation v)Relative indefatigability 2.Synapse and synapse transmission Synapse:The structure where an axon or axon branches ends on the soma,dendrites and axon ofanother neuron is called a synapse. 2.1 Classification ofsynapse Chemical synapse;electrical synapse 2.2 structure ofsynapse Presynaptic terminal Synaptic cleft Postsynaptic membrane 2.3 Chemical synapse transmission (1)EPSP: Excitary transmitter-Synaptic cleft -bind to receptors increases the membrane's permeability to all ions-sodium,potassium and chloride cross the membrane of the postsynaptic,mainly Na+enters the postsynaptic neuron- depolarizing potential is produced. (2)IPSP The inhibitory neurotransmitters increase the permeability of the postsynaptic membrane only to potassium and chloride,mainly chlorides but not Na+.The chlorides enter the postsynaptic neuron,and the hyperpolarizing potential is produced. 2.4 Characeristics ofsynaptic conductioniv) Bidirectional propagation v) Relative indefatigability 2. Synapse and synapse transmission Synapse: The structure where an axon or axon branches ends on the soma, dendrites and axon of another neuron is called a synapse. 2.1 Classification of synapse Chemical synapse; electrical synapse 2.2 structure of synapse Presynaptic terminal Synaptic cleft Postsynapticmembrane 2.3 Chemical synapse transmission (1)EPSP: Excitary transmitter → Synaptic cleft → bind to receptors → increases the membrane's permeability to all ions → sodium, potassium and chloride cross the membrane of the postsynaptic, mainly Na+ enters the postsynaptic neuron → depolarizing potential is produced. (2) IPSP The inhibitory neurotransmitters increase the permeability of the postsynaptic membrane only to potassium and chloride, mainly chlorides but not Na+. The chlorides enter the postsynaptic neuron, and the hyperpolarizing potential is produced. 2.4 Characeristics of synaptic conduction