How are signals transmitted using neurotransmitters?
A: From the synapse to the presynaptic cell, and then to the postsynaptic cell
B: From the postsynaptic cell to the presynaptic cell across a synapse
C: From the presynaptic cell to the postsynaptic cell, and then to a synapse
D: From the presynaptic cell to the postsynaptic cell across a synapse