試題詳解

20 According to the passage, which of the following statements is true?
(A) The vagus nerve is a single inner cord, stretching from the head to the stomach.
(B) Stimulating the vagus nerve to the heart has a really powerful effect on raising the heart rate.
(C) Breathing slowly reduces the oxygen demands of the heart muscle, and our heart rate drops.
(D) The vagus nerve contributes little to the mind-body connection.