Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 34, Problem 2CBQ
Summary Introduction

To analyze:

The structural and functional similarities between the compound and single-lens eyes of animals.

Introduction:

Photoreception is a type of electromagnetic sensing through which an organism’s visual system works. The organisms have specialized neurons, which are called photoreceptors that are used to detect light.

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Recall that the eye is composed of three layers or "tunics" — the fibrous, vascular, and nervous layers — which enclose two cavities that are separated from each other by the lens. Review the components of these three layers by matching each description with the appropriate letter in the figure below: 1. Fluid in the anterior portion of the eye that provides nutrients to the lens and cornea   2. The "whites" of the eye   3. Area of the retina that lacks photoreceptors   4. Contains smooth muscle that controls the shape of the lens   5. Nutritive (nourishing) layer of the eye   6. Layer containing rods and cones   7. Gel-like substance that helps support the eyeball                    8. Pigmented smooth muscles that control pupil size   9. Most anterior component of the fibrous layer — your "window to the world"   10. Structure that changes shape to bend light toward rods and cones
Provide a list of any five features of the human eye that contribute to its ability to detect and record visual information in the real world.
Give technical term for eye lens loosing flexibility resulting in kind of long sightedness in elderly people.
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