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Author Question: The ________ sphincter controls the movement of waste from the sigmoid colon into the rectum? a. ... (Read 125 times)

jhjkgdfhk

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on: Jun 25, 2018
The ________ sphincter controls the movement of waste from the sigmoid colon into the rectum?
 
  a. oddi
  b. ileocecal
  c. O'Beirne
  d. internal anal

Question 2

Which reflex inhibits gastric motility when the ileum becomes overdistended?
 
  a. Ileogastric
  b. Gastroduodenal
  c. Gastroileal
  d. Gastrocolic


ErinKing

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Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: C
The O'Beirne sphincter controls the movement of wastes from the sigmoid colon into the rectum. None of the other options performs this function.

Answer to Question 2

ANS: A
The ileogastric reflex, not the gastroduodenal, inhibits gastric motility when the ileum becomes distended. The gastroileal reflex, which is activated by an increase in gastric motility and secre-tion, stimulates an increase in ileal motility and relaxation of the ileocecal valve (sphincter). The gastrocolic reflex initiates propulsion in the entire colon, usually during or immediately after eat-ing, when chyme enters from the ileum.


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