The tricuspid valve is found in .............

Cardiac output is defined as:

Cardiac output $= ......$

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.

Define the following terms and give their location:
$(a)$ Purkinje fibres
$(b)$ Bundle of His

Which one of the following is a matching pair?