the function of sphincter is to:
A) prevent materials from moving backward
B) allow materials to move from one segment to another
C) regulate the opening of the passage
D) all the above
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Answers
A sphincter is a circular muscle that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. Sphincters are found in many animals.
hence option d
Answer D
Explanation:
There are major 5 sphincters that are present in the food canal:-
a) Esophageal sphincter - allows entry of bolus into the oesophagus and reduces the back flow from oesophagus to pharynx.
b) Cardiac sphincter - It is present where oesophagus meets the stomach.
c) Pyloric sphincter - It is present at the opening of called pylorus, located at the connection between stomach and small intestine. It allows only small quantities of food into duodenum at one time.
d) Anal sphincter - It is located at the anus and partly control the release of waste out of the body.
e) Ileo-ceacal valve - It is a sphincter muscle situated at the junction of small intestine and large intestine. It limits the reflux of colonic content into the ileum.
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