Which of the following statement(s) is/are true about the maintenance of continence?

A. It depends on both the internal and external sphincters as well as the puborectalis

B. Resting pressure offers a high-pressure zone that increases resistance to the passage of stools.

C. Maximal squeeze pressure can last no more than 1 minute.

DISCUSSION: Continence depends on numerous complex and interrelated anal, rectal, pelvic floor, and colon factors. Resting pressure depends primarily on the internal sphincter and serves to increase resistance to the passage of stool. Squeeze pressure, generated by contraction of the external sphincter, increases anal canal resting pressure and helps prevent leakage when the rectal contents are presented to the proximal anal canal at inopportune times. It lasts but a minute before fatiguing. The anorectal angle produced by anterior pull of the puborectalis encircles the rectum at the level of the anorectal ring and helps to maintain continence.