All of the following are typical characteristics of neurotransmitters except
A. they alter the physiology of the postsynaptic cell.
B. they bind to specific receptors on the postsynaptic cell.
C. they are synthesized by a presynaptic neuron.
D. they are released in response to stimulation.
E. they are released into the bloodstream before reaching the postsynaptic cell.
Answer: E
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