Question

Heart beat is controlled by which cranial nerve?

• A. X
• B. IX
• C. III
• D. V

Answer 1

The correct option is A X

There are 12 pairs of cranial nerves. A few of the cranial nervesI, II, and VIll contain only sensory fibers; some III, IV, VI, XI and Xll contain all or mostly motor fibers. The remainder V, VII, IX, and X contain both sensory and motor fibers; they are known as mixed nerves. The tenth cranial nerve (X) is the vagus nerve. It is the longest cranial nerve. (Its name means "wanderer"). The vagus nerve is responsible for such varied tasks as regulating heart rate, gastrointestinal peristalsis, sweating, and quite a few muscle movements in the mouth, including speech.