Which vein contains the oxygenated blood in humans?

The systemic aorta arises from which of the following?

The vein that does not directly open into the heart is

Chordae tendinae

The 'lub' heart sound is produced during the closure of which valves?

$A$ : 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.