EBK ESSENTIALS OF HUMAN ANATOMY & PHYSI
12th Edition
ISBN: 8220103633604
Author: KELLER
Publisher: PEARSON
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Textbook Question
Chapter 8, Problem 6MC
When the eye focuses for far vision,
a. the lens is at its thinnest.
b. the ciliary muscles contract.
c. the light rays are nearly parallel.
d. suspensory fibers of the ciliary zonule are slack.
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Students have asked these similar questions
Identify 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 →cochlea
Contraction of the smooth muscle in the ciliary body causes thea. lens to flatten. c. lens to become more spherical.b. pupil to constrict. d. pupil to dilate.
Which of the following statements are true of the physiology of vision? (Read carefully and select all the correct statements.)
A.
Cones are the receptors for color.
B.
The lens adjusts for distant vision, and the cornea adjusts for near vision.
C.
The optic nerve is formed by the ganglion neurons of the choroid layer.
D.
For near vision, the pupils dilate and the eyes converge.
E.
The optic chiasma is a crossing of optic nerve fibers that contributes to binocular vision.
F.
The visual areas are in the occipital lobes of the cerebrum.
G.
The area of the retina for the best color vision is the optic disc.
H.
Rods are most numerous at the periphery of the retina.
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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- Near and far vision are accommodated through the muscles of the A. fundus. B. ciliary body. C. iris. D. choroidarrow_forwardWhich of the following is accurate about the maculae of the vestibular apparatus? a. They detect rotational movements of the head. b. They are located in the semicircular canal. c. Nerve signals are generated when the otolithic membrane bends the stereocilia of the hair cells. d. They are the organs of hearing.arrow_forwardBecause fibers of the optic nerve that originate in the nasal halves of each retina cross over at the optic chiasma, each lateral geniculate receives input from a.both the right and left sides of the visual field of both eyes. b.the ipsilateral visual field of both eyes. c.the contralateral visual field of both eyes. d.the ipsilateral field of one eye and the contralateral field of the other eye.arrow_forward
- The arrangement of tunics in the eye, from the innermost to outermost aspect of the eye, is a. retina, vascular, fibrous. b. vascular, retina, fibrous. c. vascular, fibrous, retina. d. retina, fibrous, vascular.arrow_forwardWhen reading, a person with astigmatism sees some lines in sharp focus while others appear blurred. Astigmatism is caused by the a. inability of the iris to contract or dilate b. lens becoming cloudy and rigid c. number of cones on some parts of the retina being deficient d. curvature of the cornea or lens not being symmetricalarrow_forwardA bar of light in a specific part of the retina, with a particular length and orientation, is the most effective stimulus for a.retinal ganglion cells. b.lateral geniculate cells. c.simple cortical cells. d.complex cortical cells.arrow_forward
- Which of the following descriptions of photoreceptors in the eye is NOT correct? a. Cones are concentrated in the fovea of the retina and function to detect colours. b. Rods are concentrated at the periphery and function well in dim light. c. Rods are concentrated in the fovea of the retina and function well in dim light. d. Rods are sensitive to light and register black and white. Cones detect colours.arrow_forwardWhen reading, a person with astigmatism sees some lines in sharp focus while others appear blurred. Astigmatism is caused by the Select one: a. inability of the iris to contract or dilate b. lens becoming cloudy and rigid c. number of cones on some parts of the retina being deficient O d. curvature of the cornea or lens not being symmetricalarrow_forwardThe lens normally focuses light onto thea. optic disc. c. macula. e. ciliary body.b. iris. d. cornea.arrow_forward
- Which of the following statements explains why vision is less sharp in dim light than in bright light?a. Cones are more responsive in dim light.b. There are more rods than cones in the eye.c. Many rods converge on a single ganglion.d. The dilated pupil lets in more light than the lens can focus.arrow_forwardWhich of the following statements is correct A. The innermost layer of the retina contains mainly photoreceptors B. The axons that form the optic nerve emerge only from ganglion cells. C. Several types of ganglion cells spike whereas the others do not. D. Two of the statements are correct. E. All three statements are correct.arrow_forwardWhich of the following statements are true of the parts of the eye? (Read carefully and select all the correct statements.) A. Vitreous humor is reabsorbed into the canal of Schlemm. B. The radial muscles of the iris constrict the pupil. C. The white of the eye is formed by the sclera. D. The choroid layer absorbs light within the eyeball. E. The conjunctiva is kept moist by tears secreted by the lacrimal glands. F. The retina is the innermost layer of the eyeball. G. The ciliary muscle is a circular smooth muscle that changes the shape of the cornea. H. Aqueous humor is the tissue fluid of the eye; it nourishes the lens and cornea.arrow_forward
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