A Vagolytic Effect

Question

A vagolytic effect
A) is a fight-or-flight response.
B) is achieved by beta blockade.
C) increases heart rate.
D) refers to muscarinic activation.

Accepted Answer

A vagolytic effect refers to the blocking of the parasympathetic nervous system's activity, which would normally decrease heart rate. Increasing heart rate is the opposite of this effect, so C is the correct choice. A is incorrect because a fight-or-flight response involves activation of the sympathetic nervous system, not blocking of the parasympathetic nervous system. B is incorrect because beta blockers primarily work by blocking the effects of epinephrine and norepinephrine, which are sympathetic neurotransmitters, not parasympathetic. D is incorrect because muscarinic receptors are part of the parasympathetic nervous system, so activating them would not have a vagolytic effect.