Which of the following is associated with a decrease in cardiac output?

Read the following statements:
$I$ - Increased heart rate.
$II$ - Increased ventricular contraction force.
$III$ - Decreased cardiac efficiency.
$IV$ - Increased cardiac efficiency.
$V$ - Decreased heart rate.
$VI$ - Decreased conduction speed of action potential.
Categorize the given statements into Sympathetic and Parasympathetic nervous systems.
Sympathetic Nervous System $\quad$ Parasympathetic Nervous System

An increase in blood flow to the atria of the heart can cause the release of ............ and it causes ............ in blood vessels.

If the sympathetic nerve to the heart is cut off,the heart beat will

Select the correct option regarding the regulation of cardiac activity.

An increase in blood pressure is caused by all the following except: