Fundamentals of Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134477336
Author: Martini
Publisher: PEARSON
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Chapter 17, Problem 23RQ
Summary Introduction
Introduction:
Eye is the spherical structure that enables the organism to see its surrounding. It is light sensitive and forms the image by gathering the rays that are reflected back from the objects.
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While a student is examining the anterior half of the eye in cadaver lab, the cadaver lens falls out. Which structure(s) is/are no longer intact?
The change in focal length of an eye lens is caused by the action of the:(a) Pupil(b) Retina(c) Cilliary muscles(d) Iris
Select the best answer or answers from the choices given: Damage to the medial recti muscles would probably affect (a) accommodation, (b) refraction, (c) convergence, (d) pupil constriction.
Chapter 17 Solutions
Fundamentals of Anatomy & Physiology (11th Edition)
Ch. 17 - Prob. 1CPCh. 17 - Prob. 2CPCh. 17 - Prob. 3CPCh. 17 - Prob. 4CPCh. 17 - If you completely dry the surface of your tongue...Ch. 17 - Prob. 6CPCh. 17 - Prob. 7CPCh. 17 - Prob. 8CPCh. 17 - Prob. 9CPCh. 17 - Prob. 10CP
Ch. 17 - Prob. 11CPCh. 17 - Prob. 12CPCh. 17 - Prob. 13CPCh. 17 - Prob. 14CPCh. 17 - Prob. 15CPCh. 17 - Prob. 16CPCh. 17 - Prob. 17CPCh. 17 - Prob. 1RQCh. 17 - Prob. 2RQCh. 17 - A blind spot occurs in the retina where (a) the...Ch. 17 - Sound waves are convened into mechanical movements...Ch. 17 - The basic receptors in the internal ear are the...Ch. 17 - Prob. 6RQCh. 17 - At sunset, your visual system adapts to (a) fovea...Ch. 17 - Prob. 8RQCh. 17 - The malleus, incus, and stapes are the tiny bones...Ch. 17 - Identify the structures of the external, middle,...Ch. 17 - Prob. 11RQCh. 17 - Prob. 12RQCh. 17 - Prob. 13RQCh. 17 - Prob. 14RQCh. 17 - Prob. 15RQCh. 17 - Prob. 16RQCh. 17 - Prob. 17RQCh. 17 - Prob. 18RQCh. 17 - Prob. 19RQCh. 17 - Prob. 20RQCh. 17 - Prob. 21RQCh. 17 - Prob. 22RQCh. 17 - Prob. 23RQCh. 17 - Prob. 24RQCh. 17 - Prob. 25RQCh. 17 - Prob. 26RQCh. 17 - Prob. 27RQCh. 17 - Prob. 28RQCh. 17 - Prob. 1CCCh. 17 - Prob. 2CC
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- The focal length of the eye lens increases when eye muscles:(a) are relaxed and lens becomes thinner(b) contract and lens becomes thicker(c) are relaxed and lens becomes thicker(d) Contract and lens becomes thinner.arrow_forwardParalysis of a medial rectus muscle would affect (a) accommodation,(b) refraction, (c) depth perception, (d) pupil constriction.arrow_forwardWhen the ciliary muscle is contracted, the following will: a) lens to become more spherical b) pupil to be dilated c) pupil to contract d) the lens to be flattenedarrow_forward
- b) When the muscles connected to the crystalline lens contract fully, its focal length is 16.5000 cm. With this focal length, how far away must an object be to form sharply focused images on the retina? (Note: this distance is called the far point of vision.)arrow_forwardExplain why the condition represented in Figure 24.20(b) causes loss of vision in the center of the field of vision and blurriness in the periphery.arrow_forwardA student is referred to the eye clinic by her teacher, who suspects a need for glasses. Examination demonstrates that Janie is myopic. Will she need concave or convex lenses? Explain.arrow_forward
- Why must the subject stand 20 feet from the Snellen eye chart to test distance vision?arrow_forward(a) What is hypermetropia?(b) What are the two causes of this defect of vision?arrow_forwardWhat structure keeps a contact lens on the cornea and prevents it from becoming lodged on the posterior surface of the eyeball?arrow_forward
- Which of the following statements are true regarding the fovea centralis of the eye? A) 100% cones B) 100% rods C) 50% rods and 50% cones D) 0% rods or cones - blind spot E)located in the central portion of the lensarrow_forwardDefine optic stalkarrow_forwardStrabismus (stra-biz′mu˘ s) is a condition in which one or both eyes deviatein a medial or lateral direction. In some cases, strabismus is caused by aweakness in either the medial or the lateral rectus muscle. If the lateralrectus of the right eye is weak, in which direction does the eye deviate?arrow_forward
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