A sphincter has
A)widespread muscle fibers that converge on a common attachment site.
B)muscle fibers concentrically arranged.
C)fibers arranged in a parallel form.
D)fascicles arranged obliquely to their tendon.
E)fascicles that alternate superiorly and inferiorly.

Question

Quizplus · Accepted Answer

A sphincter is a circular muscle that surrounds and contracts a body opening or duct. Sphincters have muscle fibers that are concentrically arranged to allow for contraction and closure of the opening or duct.

A Sphincter Has