(from the article `protozoan`) ...before gradually becoming alkaline near the end of the process. The products of digestion are then absorbed into the surrounding cytoplasm, and ...
<cell biology> Cell anus: region at posterior of a ciliate where exhausted food vacuoles are expelled. ... (18 Nov 1997) ... 
Cell anus: region at posterior of a ciliate where exhausted food vacuoles are expelled.
a protozoan cell structure that is specialized for excretion
Found in some ciliates, the site at which old food vacuoles fuse with the cell surface, and undigested residues are excreted.