Which of the Following is Not the Result of the Firing

Question

Which of the following is not the result of the firing of the sympathetic nerves on the heart?
A) (+) Inotropic effect
B) (+) Chronotropic effect
C) Increased heart rate
D) Vagally induced bradycardia

Accepted Answer

Vagally induced bradycardia is not the result of the firing of the sympathetic nerves on the heart. It is the result of the activation of the parasympathetic nerves, which release acetylcholine and slow down the heart rate. The sympathetic nervous system has a positive inotropic effect, meaning it increases the strength of each contraction; a positive chronotropic effect, meaning it increases the heart rate; and overall increases cardiac output.