What happens to the heart rate if the parasympathetic nerve of a rabbit is cut?

Heart beat decreases in the following conditions $EXCEPT$ . . . . . . .

Stimulation of the vagus nerve will make the heart beat

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

The pacemaker stimulates: