Q. The duodenum, jejunum & ileum are the three regions of ___?
Solution:
The three regions of the small intestine are the duodenum, jejunum, and ileum. The ileum joins the cecum, the first portion of the large intestine, at the ileocecal sphincter (or valve). The jejunum and ileum are tethered to the posterior abdominal wall by the mesentery.
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