EBK ESSENTIALS OF HUMAN ANATOMY & PHYSI
12th Edition
ISBN: 8220103633604
Author: KELLER
Publisher: PEARSON
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Textbook Question
Chapter 8, Problem 25SAE
Many students struggling through mountains of reading assignments are told that they need glasses for eyestrain. Why is it more of a strain on the extrinsic and intrinsic muscles to look at close objects than at far objects?
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Three patients have suffered destruction of different portions of their visual pathway. Patient 1 has lost the right optic tract, patient 2 has lost the nerve fibers that cross at the optic chiasm, and patient 3 has lost the left occipital lobe. Draw a picture of what each person would perceive through each eye when looking at a white wall.
Why is the eye "strained" more upon viewing nearby objects then far objects?
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Chapter 8 Solutions
EBK ESSENTIALS OF HUMAN ANATOMY & PHYSI
Ch. 8 - Prob. 1MCCh. 8 - Alkaloids excite gustatory hairs mostly at the a....Ch. 8 - Prob. 3MCCh. 8 - Which cranial nerve controls contraction of the...Ch. 8 - The cornea is nourished by a. corneal blood...Ch. 8 - When the eye focuses for far vision, a. the lens...Ch. 8 - Convergence a. requires contraction of the medial...Ch. 8 - 8. Which of the following are paired...Ch. 8 - Movement of the ______ membrane triggers bending...Ch. 8 - 10. Sounds entering the external acoustic meatus...
Ch. 8 - Prob. 11SAECh. 8 - Prob. 12SAECh. 8 - 13. Diagram and label the internal structures of...Ch. 8 - Prob. 14SAECh. 8 - Prob. 15SAECh. 8 - 16. What is the blind spot, and why is it so...Ch. 8 - What name is given to the structure that controls...Ch. 8 - What is the fovea centralis, and why is it...Ch. 8 - 19. Trace the pathway of light from the time it...Ch. 8 - Prob. 20SAECh. 8 - 21. Define hyperopia, myopia, and emmetropia.
Ch. 8 - Prob. 22SAECh. 8 - Prob. 23SAECh. 8 - Prob. 24SAECh. 8 - Many students struggling through mountains of...Ch. 8 - Prob. 26SAECh. 8 - Prob. 27SAECh. 8 - Prob. 28SAECh. 8 - Prob. 29SAECh. 8 - Prob. 30SAECh. 8 - Prob. 31SAECh. 8 - Prob. 32SAECh. 8 - Prob. 33SAECh. 8 - Which special sense requires the most learning?Ch. 8 - 35. For each of the following descriptions,...Ch. 8 - An engineering student has been working in...Ch. 8 - Prob. 37CTCh. 8 - Prob. 38CTCh. 8 - Brandon suffered a ruptured artery in his middle...Ch. 8 - Prob. 40CTCh. 8 - Prob. 41CTCh. 8 - 42. Julie and her father love to find the...Ch. 8 - Prob. 43CTCh. 8 - 44. Mrs. Garson has an immune disorder that causes...Ch. 8 - Prob. 45CTCh. 8 - Explain the role of vitamin A in vision.
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- Larry goes to the doctor complaining that he cant see the right side of the visual field with either eye. Where in the visual signal-processing pathway is Larrys problem occurring?arrow_forwardParalysis of a medial rectus muscle would affect (a) accommodation,(b) refraction, (c) depth perception, (d) pupil constriction.arrow_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
- As a person ages, their ability to focus on near objects(accommodation) changes. If a person is already myopic(near-sighted), why would corrective lenses not benecessary to read a book or computer screen?arrow_forwardBlindsight is the condition in which someone with damage in the primary visual cortex reports that they cannot see an object, but can usually guess what that object is. This means that some visual representation must reach the frontal speech area. What non-thalamic pathway might do that? Question 8 options: A) The pathway through the suprachiasmatic nucleus B) The dorsal visual pathway C) The pathway through the superior colliculus D) The magnocelluar or M pathwayarrow_forwardWould the receptors for equilibrium work in space at zero gravity?arrow_forward
- What's the difference between distant object focus and close object focus in terms of eye movement (ciliary muscles, ligament, lens)?arrow_forwardWhere are the tensor tympani and the stapedius muscleslocated, and what important function do they perform?arrow_forwardTransforming visual input into motor output involves ______and______ 1. dorsal premotor area for reaching; supplementary motor area for grasping 2. supplementary motor area for reaching; ventral premotor area for grasping 3. supplementary premotor area for grasping; ventral premotor area for reaching 4. dorsal premotor area for reaching; ventral premotor area for grasping 5. dorsal premotor area for grasping; ventral premotor area for reachingarrow_forward
- Select the best answer or answers from the choices given: Which reactions occur when a person looks at a distant object? (a) pupils constrict, ciliary zonule (suspensory ligament) relaxes, lenses become less convex; (b) pupils dilate, ciliary zonule becomes taut, lenses become less convex; (c) pupils dilate, ciliary zonule becomes taut, lenses become more convex; (d) pupilsconstrict, ciliary zonule relaxes, lenses become more convex.arrow_forwardAssuming that someone is looking forwards while sitting in an office chair, which structure is most activated when spun in a circle? 1. Crista ampullaris of the posterior semicircular canal 2. Crista ampullaris of the lateral semicircular canal 3. Crista ampullaris of the anterior semicircular canal 4. Saccular maculaearrow_forwardIdentify the visual accommodation when focusing on a near object. A. Ciliary muscles contract, suspensory ligaments relax to make lens thick. B. Ciliary muscles relax and pull on the suspensory ligaments to make lens thin. C. Ciliary muscles relax and pull on the suspensory ligaments to make lens thick. D. Ciliary muscles contract, suspensory ligaments relax to make lens thin. . Recognize the sound transmission towards the inner ear. A. Auditory meatus → cochlea → ossicles → oval window → tympanic membrane B. Auditory meatus → tympanic membrane → ossicles → cochlea →oval window C. Auditory meatus → ossicles → tympanic membrane → oval window →cochlea D. Auditory meatus → tympanic membrane → ossicles → oval window →cochleaarrow_forward
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