The heart's normal activities are regulated:

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:

Stimulation of the vagus nerve will make the heart beat

Select the correct option regarding the regulation of cardiac activity.

Fall in blood pressure due to loss of blood is soon restored because the