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How do parasympathetic neural signals affect the working of the heart?

  1. A
    Reduce both heart rate and cardiac output.
  2. B
    Heart rate is increased without affecting the cardiac output.
  3. C
    Both heart rate and cardiac output increase.
  4. D
    Heart rate decreases but cardiac output increases.

Solution & Step-by-step Explanation

The parasympathetic nervous system (primarily via the Vagus nerve) releases acetylcholine, which acts on the SA node to decrease the heart rate. Since Cardiac Output = Heart Rate Stroke Volume, a decrease in heart rate leads to a reduction in cardiac output.

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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.

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