The tips of neuronal axons communicate with other nerve cells by releasing small molecules called neurotransmitters. These neurotransmitters need to cross a very tiny pocket of fluid to reach the next neuron; the distance is about 0.001 times the length of the smallest axon in this lab. Could this happen through diffusion? A. Yes, because the neurotransmitters will want to reach their target neuron on the other side of the fluid pocket.

B. Yes, because the neurotransmitters are at high concentration near the diffusing axon and at low concentration next to the receiving neuron.

C. No, because diffusing any distance takes a very long time, and neural communication has to happen rapidly.

D. No, because diffusion does not work within very small spaces, only in large areas where there is room for the molecules to move.

B

Explanation:

This is the principle of diffusion.which depends on  concentration gradients..Diffusion is the movement of molecules of substances from the region of higher concentration,to the region of low concentration.It depends on the surface area available,the  diffusion distance and concentration concentration gradient of the substances available.

It is direction ally proportional to the r the surface area available,the conc. gradients and inversely proportional to the diffusion distance bested on Fick's Law.

In this question; the neurotransmitters are at higher conc. at the end of the axon releasing the neurotransmitters through the  pre-synaptic vesicles into the synaptic cleft..Based on concentration gradients,the molecules of Neurotransmitters will therefore diffuse down the concentration gradient to the post-synaptic neuron.

The chemical substances in the vesicle of the neuron  for exciting or inhibiting the neurons are  called neurotransmitters.E.g Dopamine. Acetycholine.