What makes unconventional neurotransmitters (i.e., endocannabinoids) so unique compared to more "classical" neurotransmitters (i.e., acetylcholine)?
A. Unconventional neurotransmitters always cause inhibitory postsynaptic potentials (IPSPs).
B. Unconventional neurotransmitters only activate ligand-gated receptors.
C. Unconventional neurotransmitters are synthesized in the cell body and have to be transported via vesicular transport down the axon.
D. Unconventional neurotransmitters are synthesized in the postsynaptic neuron and bind to receptors on the presynaptic neuron.