1) What is a sphincter muscle?

Biology

1 answer:

serious [3.7K]3 years ago

7 0

Answer:

1-A ring-shaped muscle that relaxes or tightens to open or close a passage or opening in the body.

2-Sphincters are specialized muscles that are located at the upper esophagus (upper esophageal sphincter (UES) and the gastroesophageal junction

Explanation:

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