7. Chemical synapses are characterized by A. the release of neurotransmitter by the presynaptic terminal. B. protein channels that connect the pre- and postsynaptic cells. C. the presence of receptors for neurotransmitters on the presynaptic terminal. D. the absence of gap junctions. E. receptors located only on the presynaptic terminal 8. Neurotransmitters are released from the A. epineurium. B. synaptic cleft. C. presynaptic terminal. D. postsynaptic membrane. E. calcium channels.