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How do parasympathetic neural signals affect the working of the heart?
A
Reduce both heart rate and cardiac output
B
Heart rate is increased without affecting the cardiac output
C
Both heart rate and cardiac output increase
D
Heart rate decreases but cardiac output increases
Detailed Solution
Parasympathetic signals (through the vagus nerve) decrease the rate of heartbeat and the speed of conduction of the action potential, and so reduce the cardiac output.