522-1675 As you glance at the person sitting next to you in class, light... (1153 Questions & Answers)

522 As you glance at the person sitting next to you in class, light
reflected from the person's shirt first passes through which
three structures of your eye?
· pupil, iris, lens Incorrect
· cornea, iris, pupil Incorrect
· cornea, pupil, lens (True Answer )Correct
· fovea, iris, pupil Incorrect

523 In _____, an abnormally curved eyeball results in blurry vision
for lines in a particular direction.

· presbyopia Incorrect
· astigmatism (True Answer )Correct
· myopia Incorrect
· hyperopia Incorrect

524 How do glasses correct visual problems?


· Glasses correct vision by amplifying the frequencies of
incoming light waves, which magnifies and enlarges the image
that falls on the retina. Incorrect
· Glasses correct vision by intercepting and bending incoming
light waves so that they are focused properly on the
retina. (True Answer )Correct
· Looking through the corrective lenses exercises the muscles
of the eye, aligning the eye structures properly. Incorrect
· The corrective lenses diffuse the incoming light, which causes
the pupil to widen and let in more light waves, enhancing visual
acuity. Incorrect

525 The sensory receptors for vision are:


· found in the pupil. Incorrect
· the rods and cones of the retina. (True Answer )Correct
· found in the lens and cornea. Incorrect
· distributed throughout the inner eye. Incorrect

526 Each eye contains about _____ rods and about _____ cones.


· 7 million; 125 million Incorrect
· 25; 200 Incorrect
· 1 million; 3 million Incorrect

, · 125 million; 7 million (True Answer )Correct

527 Rods are used for vision in _____ light, and cones are used for
vision in _____ light.

· bright; dim Incorrect
· black; white Incorrect
· dim; bright (True Answer )Correct
· colorful; black and white Incorrect

528 The visual sensory receptor cells that transform light energy
into a neural signal are the:

· bipolar cells in the blind spot. Incorrect
· ganglion cells in the optic disc. Incorrect
· bipolar cells in the optic nerve. Incorrect
· rods and cones in the retina. (True Answer )Correct

529 Identify the sequence that correctly represents the path taken
by light signals through the eye.

· lens, pupil, optic nerve, retina Incorrect
· cornea, pupil, lens, retina (True Answer )Correct
· cornea, lens, iris, retina Incorrect
· lens, iris, retina, pupil Incorrect

530 The thin, light-sensitive membrane that lies at the back of the
eye and contains the sensory receptors for light is the _____.

· fovea Incorrect
· optic disk Incorrect
· retina (True Answer )Correct
· optic nerve Incorrect

531 What happens when rods and cones are exposed to light?


· They undergo accommodation. Incorrect
· They undergo a chemical reaction that results in a neural
signal. (True Answer )Correct
· They become more light-sensitive and thus cause an increase
in visual acuity. Incorrect
· They create problems with dark adaptation in the
fovea. Incorrect

,532 Rods and cones are:


· the sensory receptor cells for vision, found in the
retina. (True Answer )Correct
· the sensory receptor cells for hearing, found in the
cochlea. Incorrect
· the tiny bones of the middle ear. Incorrect
· the sensory receptor cells for taste, embedded in the taste
buds. Incorrect

533 Which type of sensory receptors are involved in color vision?


· trichromatic cells Incorrect
· cones but not rods (True Answer )Correct
· rods but not cones Incorrect
· both rods and cones Incorrect

534 Rods are to cones as _____ is to _____.


· slow adaptation; quick adaptation (True Answer )Correct
· vision in bright light; vision in dim light Incorrect
· less sensitive to light; more sensitive to light Incorrect
· color vision; visual acuity Incorrect

535 Cones are most concentrated in the:


· periphery of the eye. Incorrect
· optic disk. Incorrect
· optic chiasm. Incorrect
· fovea. (True Answer )Correct

536 What region of the eye has the largest concentration of cones?


· the periphery Incorrect
· the iris Incorrect
· the optic nerve Incorrect
· the fovea (True Answer )Correct

537 The brain receives less detailed information from the _____
than from the _____.

, · lens; cones Incorrect
· cones; rods Incorrect
· rods; cones (True Answer )Correct
· cones; lens Incorrect

538 Rods are to cones as _____ is(are) to _____.


· peripheral vision and night vision; color vision and visual
acuity (True Answer )Correct
· color vision and night vision; bright light
conditions Incorrect
· bipolar cells; ganglion cells Incorrect
· color vision and visual acuity; peripheral vision and night
vision Incorrect

539 The blind spot is caused by:


· diabetes. Incorrect
· the absence of rods or cones at the point where the optic
nerve leaves the eye. (True Answer )Correct
· malformation of the eyeball. Incorrect
· degeneration of the optic nerve. Incorrect

540 What is the optic disk?


· a tiny spot in the center of the fovea where there is a high
concentration of rods and cones Incorrect
· the portion of the lens that focuses incoming light Incorrect
· the point at which the optic nerve fibers leave the back of the
eye (True Answer )Correct
· a transparent membrane that lies just behind the pupil of the
eye and that helps funnel light waves to the lens and
retina Incorrect

541 What does the optic disk cause?


· our color vision Incorrect
· our night vision Incorrect
· our blind spot (True Answer )Correct
· our light adaptation Incorrect