Emergency Medical Technician (EMT) Intermediate Practice Exam

What type of fibers does the vagus nerve carry?

1. Sympathetic fibers

2. Parasympathetic fibers

3. Motor fibers

4. Sensory fibers

The correct answer is: Parasympathetic fibers

The vagus nerve is primarily known for carrying parasympathetic fibers, which are a crucial part of the autonomic nervous system. These fibers are responsible for regulating involuntary bodily functions, such as heart rate, digestion, and respiratory rate. The vagus nerve's parasympathetic activity facilitates a 'rest and digest' response, promoting relaxation and conservation of energy after stress or exertion. While the vagus nerve does have some motor and sensory functions, its dominant role is in the parasympathetic division of the autonomic nervous system. It is not associated with sympathetic fibers, which would prepare the body for 'fight or flight' responses. Understanding the role of the vagus nerve can help in interpreting clinical symptoms and managing patient care effectively, especially in scenarios involving autonomic responses or gastrointestinal issues.