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.

The NCERT line that answers it

Verbatim line

On the other hand, parasympathetic neural signals (another component of ANS) decrease the rate of heart beat, speed of conduction of action potential and thereby the cardiac output.

Chapter: Body Fluids and Circulation
Section: 15.5 REGULATION OF CARDIAC ACTIVITY
Page: 9
Words matched: 28 of 28

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that parasympathetic neural signals 'decrease the rate of heart beat... and thereby the cardiac output,' which directly matches option A's claim of reducing both heart rate and cardiac output.

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