"the of a neuron contain that house neurotransmitters, the chemical messengers of the nervous system."

The correct terms to fill in the blank are terminal buttons and synaptic vesicles. The terminal button of a neuron contain synaptic vesicles that house neurotransmitters, the chemical messengers of the nervous system.  These terminal buttons are small knobs that are located at the end of the axon that is responsible of releasing the neurotransmitters. It is also known as presynaptic terminal button. It aids in speeding up neural impulses. Also, they are responsible of sucking up excess amounts of neurotransmitters by the process called the reuptake. The chemicals found in these buttons allows the neurons to communicate to the whole body.

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