The heart sound can be heard by using this instrument.

Choose the correct option: The $AV$ node / $SA$ node is called the pacemaker.

The blood pumped by the $A$ ventricle enters the $B$ artery,whereas the $C$ ventricle pumps blood into the $D$. Choose the correct option for $A, B, C$ and $D$.

The trilobed valve present between the right atrium and the right ventricle in the mammalian heart is known as:

The human heart is which type?

In which one of the following pairs do the two items mean one and the same thing?