The following statements concerning the diaphragm are correct except
A.
The right crus provide a muscular sling around the esophagus and possibly prevent regurgitation of stomach contents into the esophagus.
B.
On contraction, the diaphragm raises the intra-abdominal pressure and assists in the return of the venous blood to the right atrium of the heart.
C.
The level of the diaphragm is higher in the recumbent position than in the standing position,
D.
On contraction, the central tendon descends, reducing the intrathoracic pressure.
E.
The esophagus passes through the diaphragm at the level of the eighth thoracic vertebra.