Anatomy & Physiology: The Unity of Form and Function, 7th Edition

Published by McGraw-Hill Education
ISBN 10: 0073403717
ISBN 13: 978-0-07340-371-7

Chapter 10 - The Muscular System - Study Guide - Assess Your Learning Outcomes - Page 373: 2

Answer

Statement 2 is **true**. The orbicularis oculi is indeed a sphincter muscle. The orbicularis oculi muscle encircles the eye and is responsible for closing the eyelids, which is essential for activities like blinking, squinting, and protecting the eye. Its circular shape and function make it a sphincter muscle, as it can contract and constrict the opening it surrounds.

Work Step by Step

Statement 2 is **true**. The orbicularis oculi is indeed a sphincter muscle. The orbicularis oculi muscle encircles the eye and is responsible for closing the eyelids, which is essential for activities like blinking, squinting, and protecting the eye. Its circular shape and function make it a sphincter muscle, as it can contract and constrict the opening it surrounds.
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