Bradycardia indicates slow heart rate, generally below . . . . . . per minute. (in $beats$)

Heart sound '$dup$' is caused due to the closing of:

Analogy type questions:
$(1)$ Right atrium and right corner : $SA$ node :: Corner of right atrium : .......
$(2)$ First heart sound : $Lubb$ :: Second heart sound : ...........

The wall of the human heart is thick due to:

The $Conus$ $arteriosus$ is considered a part of the heart because:

Which is an incorrect statement?