$A$ heart murmur occurs due to a defect in:

The tricuspid valve is present at the origin of

Ventricular systole increases the ventricular pressure causing the

All the components of the conducting system can generate an action potential for the contraction of heart muscle,but the Sinoatrial node acts as the pacemaker because

Where is the $Foramen \text{ } ovale$ (a remnant of embryonic life) located?

Which of the following statements regarding the size of heart chambers is correct?