NEET2014ZoologyBody Fluids and CirculationActual
How do parasympathetic neural signals affect the working of the heart?
Options
- AReduce both heart rate and cardiac output
- BHeart rate is increased without affecting the cardiac output.
- CBoth heart rate and cardiac output increase
- DHeart rate decreases but cardiac output increases.
Correct answer
A. Reduce both heart rate and cardiac output
Step-by-step solution
Parasympathetic signals reduce both heart rate and cardiac output through the cholinergic, post-ganglionic fibers. The parasympathetic system releases the hormone acetylcholine to slow the heart rate.