Neurotransmitters that act ________ are classified as ________, whereas neurotransmitters that act ________are classified as ________
A. Directly; slow-acting; indirectly; fast-acting
B. Directly; inhibitory; indirectly; excitatory
C. Directly; fast-acting; indirectly; slow-acting
D. Directly; excitatory; indirectly; inhibitory
ANS: C
Rationale: Neurotransmitters act either directly, by activating ion channels (ionotropic); or indirectly, by activating postsynaptic neuron proteins (metabotropic). Direct-acting neurotransmitters are classified as fast-acting, because their effects last less than 1/1000 of a second. Indirect acting neurotransmitters are classified as slow-acting, because their effects require 1/10 of a second to several minutes.
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