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The PARASYMPATHETIC nervous system (via the vagus nerve) influences the heart by:
AIncreasing heart rate via norepinephrine release
BIncreasing contractility through adrenaline release
CDecreasing heart rate via acetylcholine release
DIncreasing the rate of conduction through nodes
Answer & Solution
Correct answer: C. Decreasing heart rate via acetylcholine release
Parasympathetic (vagus nerve, acetylcholine) DECREASES heart rate. Sympathetic (norepinephrine) increases it. Both autonomic systems balance cardiac output continuously.
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