An electrical synapse is characterized by (a) the release of neurotransmitter by the presynaptic membranes, (b) postsynaptic membranes bearing receptors that bind neurotransmitter, (c) absence in...

An electrical synapse is characterized by (a) the release of neurotransmitter by the presynaptic membranes, (b) postsynaptic membranes bearing receptors that bind neurotransmitter, (c) absence in embryonic nervous tissues, (d) channel proteins, called connexons, connecting the cytoplasm of adjacent neurons.

Inhibition of acetyl cholinesterase by poisoning blocks neurotransmission at the neuromuscular junction because (a) ACh is no longer released by the presynaptic terminal,

(b) ACh synthesis in the presynaptic terminal is blocked, (c) ACh is not degraded, so prolonged depolarization is enforced on the postsynaptic cell, (d) ACh is blocked from attaching to the postsynaptic ACh receptors.