When a nerve impulse reaches the terminal buttons, chemical communicators called _____ are released.

• A. enzymes
• B. neurotransmitters
• C. antibodies
• D. hormones

Answer: (B)

Verified step by step guidance

1. Understand the context: The question is about the process that occurs when a nerve impulse reaches the terminal buttons of a neuron. Terminal buttons are the small structures at the end of axons that play a role in transmitting signals to other cells.
2. Recall the function of terminal buttons: When a nerve impulse (action potential) reaches the terminal buttons, it triggers the release of chemical messengers that help transmit the signal across the synaptic gap to the next neuron or target cell.
3. Identify the correct term: The chemical messengers released by neurons are called neurotransmitters. These molecules bind to receptors on the postsynaptic cell to propagate or modulate the signal.
4. Eliminate incorrect options: Enzymes are proteins that catalyze biochemical reactions, antibodies are immune system proteins, and hormones are signaling molecules released into the bloodstream. None of these fit the role described in the question.
5. Conclude: The correct answer is neurotransmitters, as they are the specific chemical communicators released at the terminal buttons during synaptic transmission.