The upper thoracic spinal nerves:
A) innervate the muscles of the chest that help in breathing and coughing.
B) regulate the parasympathetic nervous system and inhibit inspiration.
C) are the only pair of spinal nerves that do not truly exit the spinal cord.
D) provide abdominal muscle control and contain sympathetic nerve fibers.
Answer: A) innervate the muscles of the chest that help in breathing and coughing.
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