what is anal sphincter? why isn't any info about it provided in the study material?

Anal sphincters are the set of muscles that are under voluntary control, these spinchters keep the anus closed as feaces accumulate there and when pressure rises then the urge to defeacate develops and then anal sphincter opens under voluntary control.

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The anus is an opening at the opposite end of an animal's digestive tract from the mouth. Its function is to control the expulsion of feces, unwanted semi-solid matter produced during digestion, which, depending on the type of animal, may be one or more of: matter which the animal cannot digest, such asbones;

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