Neurotransmitters are small molecules that exert their actions through specific proteins, called receptors, embedded in the postsynaptic membrane. where are neurotransmitters synthesized?

Neurotransmitters are synthesized in the pre-synaptic neuron terminal buttons to allow for the transmission of an action potential across the synaptic gap to the post-synaptic neuron. They are released through exocytosis from the pre-synaptic neuron and cause messages to be transmitted between neurons which are obtain by the various types of sensory receptors within the body.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.