A drug may cause decreased communication between neurons or between neurons and muscles or glands. What might be the common action of this drug to cause such varied effects? A. It prevents release of the neurotransmitter substances. B. It prevents breakdown of neurotransmitter substances. C. It interferes with receptors on the axon of the presynaptic neuron. D. It damages effector cell membranes. E. It causes demyelination of the postsynaptic cell membranes.
