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Which neurotransmitter among the following stimulates the diaphragm during inspiration?
Acetylcholine
Dopamine
Serotonin
GABA
Answers (1)
The nervous system controls the contraction of respiratory muscles during inspiration. Acetylcholine is the primary neurotransmitter responsible for stimulating and initiating the contraction of the diaphragm. Neurons originating from the cervical segments of the spinal cord, release acetylcholine at the neuromuscular junctions of diaphragm muscle fibers. Acetylcholine binds to receptors on the muscle fibers, causing depolarization and generating an action potential. This action potential spreads along the muscle fibers, resulting in their contraction. The diaphragm's contraction moves it downward, expanding the thoracic cavity and facilitating inspiration.
Hence, the correct answer is option 1.
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