Question

which of the following is/are released by a neurons terminal buttons into the synapse?
neurotransmitters
myelin
electrical impulses
reactionary responses
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Explanation:

To solve this, we analyze each option:

• Neurotransmitters: Released by terminal buttons into the synapse to transmit signals between neurons.
• Myelin: Insulates axons (not released into synapse).
• Electrical impulses: Travel along the neuron (not released into synapse).
• Reactionary responses: Are behavioral/physiological reactions (not released by terminal buttons).

Thus, Neurotransmitters are released into the synapse.

Answer:

Neurotransmitters (the option with the blue circle, labeled "Neurotransmitters")