Which of the following is least true of the vagus nerve?
A)Cholinergic
B)Slows heart rate
C)Effect on the heart is eliminated by a Beta₁-adrenergic blocker
D)Transmitter is ACh

Question

Quizplus · Accepted Answer

The vagus nerve is cholinergic, which means it releases the neurotransmitter acetylcholine (ACh). One of its main functions is to slow down the heart rate, making option B true. Option D is also true since ACh is the primary transmitter released by the vagus nerve. However, option C is least true because the effect of the vagus nerve on the heart cannot be eliminated by a Beta₁-adrenergic blocker. In fact, Beta₁-adrenergic blockers are sometimes used to enhance the effects of vagal stimulation on the heart.

Which of the Following Is Least True of the Vagus