Sphincters are special, circular muscles that open and close certain body parts. Most often, the sphincter regulates the passage of some type of fluid, such as bile, urine, or fecal matter.
Explanation:
The action of sphincters may happen involuntarily through the autonomic nervous system or maybe under some voluntary control through the somatic nervous system.
A ring-shaped muscle that relaxes or tightens to open or close a passage or opening in the body. Examples are the anal sphincter (around the opening of the anus) and the pyloric sphincter (at the lower opening of the stomach).
Explanation:
A ring-shaped muscle that relaxes or tightens to open or close a passage or opening in the body. Examples are the anal sphincter (around the opening of the anus) and the pyloric sphincter (at the lower opening of the stomach).
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Verified answer
Answer:
Sphincters are special, circular muscles that open and close certain body parts. Most often, the sphincter regulates the passage of some type of fluid, such as bile, urine, or fecal matter.
Explanation:
The action of sphincters may happen involuntarily through the autonomic nervous system or maybe under some voluntary control through the somatic nervous system.
Answer:
A ring-shaped muscle that relaxes or tightens to open or close a passage or opening in the body. Examples are the anal sphincter (around the opening of the anus) and the pyloric sphincter (at the lower opening of the stomach).
Explanation:
A ring-shaped muscle that relaxes or tightens to open or close a passage or opening in the body. Examples are the anal sphincter (around the opening of the anus) and the pyloric sphincter (at the lower opening of the stomach).