In humans,blood flows from the posterior vena cava into the diastolic right atrium due to:

Identify the correct statement.
$I$. The impulse of the heart beat originates from $SAN$.
$II$. Rate of the heart is determined by $SAN$.
$III$. Bundle of His/$AV$ bundle is present in the interventricular septum.
$IV$. Atrio Ventricular Node $(AVN)$ is situated in the lower left corner of the right auricle.
Choose the correct option.

How many times does the heart beat in one minute?

Which scientist discovered the circulation of blood?

Why do we call our heart myogenic?

The remnant of the embryonic aperture on the inter-auricular septum is called . . . . . . .