NEET2020ZoologyBody Fluids and CirculationActual
Which of the following is associated with decrease in cardiac output?
Options
- ASympathetic nerves
- BParasympathetic neural signals
- CPneumotaxic centre
- DAdrenal medullary hormones
Correct answer
B. Parasympathetic neural signals
Step-by-step solution
The sympathetic nerve ending releases noradrenaline which stimulates the SAN that accelerates the heartbeat, the strength of ventricular contraction and thereby the cardiac output. The parasympathetic nerve ending releases acetylcholine which decreases the rate of heartbeat, speed of conduction of action potential and thereby the cardiac output. The adrenal medulla of the adrenal gland secretes two hormones called adrenaline and noradrenaline. Both the hormones are rapidly secreted in response to the stress of any