Valves and sphincters both play crucial roles in controlling the flow of fluids within the body. However, there are notable differences between the two. Let's delve into what these structures are and how they differ from each other.
Valves and sphincters both play crucial roles in controlling the flow of fluids within the body. However, there are notable differences between the two. Let's delve into what these structures are and how they differ from each other.
Valves are flap-like structures found within hollow organs. They allow fluids to flow in a single direction while preventing any backflow. These structures momentarily close to stop the fluid from flowing backward.
Examples of valves include the pulmonary valve in the heart and the venous valves in veins, which regulate the flow of blood.
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Sphincters, on the other hand, are circular muscles that contract and relax to regulate the flow of bodily fluids. When the sphincter contracts, it shortens the lumen (the interior space of a tubular structure), closing the passage. When it relaxes, the lumen lengthens, and the passage opens.
The human body has more than 60 types of sphincters. For instance, the anal sphincter controls the expulsion of feces from the body, and the esophageal sphincter manages the passage of food into the stomach.
Valve | Sphincter |
---|---|
Description | |
A flap-like structure in hollow organs that allows one-way fluid flow. | A circular muscle that contracts and relaxes to regulate the passage of bodily fluids. |
Appearance | |
Flap-like. | Ring-like. |
Examples | |
Pulmonary valve, Venous valves. | Anal sphincter, Esophageal sphincter. |
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