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Injury to vagus nerve in humans is not likely to affect

1. tongue movements
2. gastrointestinal movements
3. pancreatic secretion
4. cardiac movements

Correct answer: tongue movements

Solution

The vagus nerve regulates parasympathetic functions in the heart, gut, and many digestive glands, including pancreatic secretion. Tongue movements are primarily controlled by the hypoglossal nerve (CN XII), so they are not likely to be affected by vagus injury.

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