what is the difference between valve and sphincter ? Rply soon
A valve is a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it whereas a sphincter is an opening of skin and surrounded by muscle that physically restricts and controls the passage of substances through the digestive tract. There are three main sphincters in the digestive tract: the esophageal sphincter, the pyloric sphincter and of course the anal sphincter.
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