Question

Neural signals through parasympathetic neural signals (another component of ANS) can

a. Increase the heart beat rate
b. Decrease the heart beat rate
c. Increase the strength of ventricular contraction
d. Decrease the speed of conduction of action potentials
e. Increase the cardiac output
f. Decrease the cardiac output

• A. a, d and f
• B. a, c and e
• C. b, c and e
• D. b, d and f

Answer 1

The correct option is D b, d and f

Effect of neural signals from parasympathetic nervous system on heart

In order to normalise the body function which are altered due to release of emergency hormones, the vagus nerve, a part of parasympathetic nervous system releases acetylcholine.

Acetylcholine, a neurotransmitter, binds with various receptors present in the heart which has following effects:

• Decreases the heart beat rate
• Decreases the strength of ventricular contraction
• Decreases the cardiac output

Final answer: (C) b, d and f