Which one of the following cranial nerves plays an important role in regulating heartbeat?
A
IX
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B
VII
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C
X
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D
VIII
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Solution
The correct option is C X The vagus nerve is one of 12 cranial nerves. It is the longest of the cranial nerve, extending from the brainstem to the abdomen by way of multiple organs including the heart, esophagus, and lungs. Also known as cranial nerve X, the vagus forms part of the involuntary nervous system and commands unconscious body procedures, such as keeping the heart rate constant and controlling food digestion.