The circulation of blood was discovered by

Purkinje fibres are found in

The pulmonary artery carries:

$A$ : Left ventricle pumps blood at a much higher pressure to all body parts involved in systemic circulation.
$R$ : The muscular wall of the left ventricle is two to four times as thick as the wall of the right ventricle.

In the given diagram of the vertical section of the human heart,which label represents the papillary muscles?

If the chordae tendineae of the tricuspid valve of a human heart are partially non-functional due to some injury,what will be the immediate effect?