What are the first ten amendments to the U.S. Constitution are collectively known as? Select one: A. The Bill of Rights B. The w
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The letter A is the one that represents a neurotransmitter acting via direct effects.
<h3>What is a neurotransmitter?</h3>These are chemical messenger that helps carries signals across the neurons and target cells throughout the body.
Hence, the letter A represents a neurotransmitter acting via direct effects because its involves direct connection between the neurons.
Therefore, the Option A is correct.
Read more about neurotransmitter
<em>brainly.com/question/26387085</em>
