Which type of cell is primarily responsible for secreting acetylcholine during synaptic transmission?

• A. Astrocyte
• B. Schwann cell
• C. Oligodendrocyte
• D. Motor neuron

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the context of the question. Acetylcholine is a neurotransmitter involved in synaptic transmission, which is the process of communication between neurons or between neurons and muscles.
2. Step 2: Recall the role of motor neurons. Motor neurons are specialized nerve cells that transmit signals from the central nervous system to muscles, enabling movement. They are responsible for releasing acetylcholine at the neuromuscular junction.
3. Step 3: Eliminate incorrect options. Astrocytes are glial cells that support neurons but do not secrete neurotransmitters like acetylcholine. Schwann cells and oligodendrocytes are involved in myelination of axons but are not responsible for neurotransmitter secretion.
4. Step 4: Focus on the correct option. Motor neurons release acetylcholine during synaptic transmission to activate muscle contraction.
5. Step 5: Conclude that motor neurons are the primary cells responsible for secreting acetylcholine during synaptic transmission, as they play a direct role in communication with muscle cells.