Hawaii Massage License Practice Exam

Which cranial nerve is responsible for controlling the heart and lungs?

1. Olfactory

2. Trigeminal

3. Vagus

4. Optic

The correct answer is: Vagus

The cranial nerve that is responsible for controlling the heart and lungs is the vagus nerve. This nerve is exceptionally important as it is involved in the autonomic regulation of the heart, influencing heart rate, and playing a key role in the parasympathetic nervous system. The vagus nerve helps to decrease heart rate and promotes digestive activity by signaling various bodily functions. It also innervates the lungs, helping to regulate respiratory function by stimulating bronchoconstriction and mucus secretion. This unique function of the vagus nerve sets it apart from the other cranial nerves mentioned. The olfactory nerve is primarily responsible for the sense of smell, while the trigeminal nerve is involved in sensory perception and motor functions related to the face and jaw. The optic nerve is focused on vision through the transmission of visual information from the retina to the brain. In summary, the vagus nerve's effects on both the heart and lungs underscore its critical role in maintaining homeostasis and regulating vital functions in the body.