We know that sphincters guard the opening of many ducts and organs too. But what regulates the sphincters? Are they regulates by our nerves or some hormones?

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Solution

They are strong muscles, contraction and relaxation of these muscles causes their opening and closing. And ofcourse they are innvervated by parasympathetic and sympathetic nerves.

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Name the sphincter which regulates the exit of food from the stomach

	Column I		Column II
A.	Sphincter of ani internus	(i)	Opening of hepato-pancreatic duct into duodenum
B.	Cardiac sphincter	(ii)	Between duodenum and posterior stomach
C.	Sphincter of Oddi	(iii)	Guarding the terminal part of alimentary canal
D.	Ileocaecal sphincter	(iv)	Between oesophagus and anterior stomach
E.	Pyloric sphincter	(v)	Between small intestine and bowel

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