Neurotransmitter diffusion

1. Neurotransmitter diffusion vs. active transport (Nootropic Key Ideas)
2. Neurotransmitter diffusion vs. synaptic cleft reuptake (Nootropic Key Ideas)
3. Cell Body vs. Axon (Neuroscience Tips)
4. Axon Terminal vs. Presynaptic Membrane (Neuroscience Tips)