Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 33 - Self-Quiz - Page 579: 12



Work Step by Step

The ciliary muscle controls the shape of the lens. When this muscle is relaxed as you try to view distant objects, the fibers that connect the muscle to the lens stretch, causing the lens to flatten. When the muscle is contracted when you try to see something up close, the fibers slacken and the lens becomes rounder.
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