Question

What is the difference between valve and sphincter?

Answer 1

A sphincter actively assists flow in one direction (by relaxing) and actively resists flow in the opposite direction (by contracting) while a valve is purely a mechanical arrangement like a door that opens only in one way. The cardiac sphincter shows all characteristics of a sphincter and hence it is called as such.
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Answer 2

HEY MATE

HERE IS YOUR ANSWER

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.

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