The arrival of a neural impulse at the axon terminal causes the release of neurotransmitter from the synapse.
<h3>What are neurotransmitters?</h3>
A neurotransmitter is indeed a signaling molecule that a neuron secretes to affect some other cell all over a synapse.
The cell that receives the signal, which could be any major body part or target cell, could be another neuron or a gland or muscle cell.
An action potential travels the length of an axon and causes neurotransmitter release at the synapse.
The neuron can interact with other neurons thanks to the action potential and subsequent transmitter release.
Thus, the correct answers are neurotransmitter and synapse respectively.
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Answer:
D. They define geological periods because scientists use them as reference points for tracking the history of the earth.
Explanation:
Catastrophic events related to changes in geological timeline are very useful in defining geological periods.
These events have very significant appearance in the geological record and can be used to determine the history of the earth.
The catastrophic events usually culminates into extinction cycles or termination of some organisms from the earth surface.
Geologists use these events that are often wide spread to delineate geological periods.
Proto planets I believe or gasses