Human Biology: Concepts and Current Issues
7th Edition
ISBN: 9780321821652
Author: Michael D. Johnson
Publisher: Benjamin Cummings
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Chapter 12, Problem 11TY
Summary Introduction
Introduction:
Photoreceptor cells are the cells that are found in the retina. There are three types of photoreceptors cells, which are rods, cones, and photosensitive retinal ganglion cells. Rod cells are the cells that are responsible for vision in low light levels, whereas the cones cells are responsible for vision in bright light.
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Why is a retinal defect, such as retinitis pigmentosa, which causes tunnel vision, associated with night blindness?
a. Tunnel vision and night blindness are unrelated conditions.
b. The high density of rod photoreceptors in the fovea are unaffected in each condition.
c. The highest resolution cone photoreceptors are found exclusively in the outer regions of the retina.
d. The color-detecting cone photoreceptors have the greatest density in the outer regions of the retina.
e. The highly-sensitive rod photoreceptors are located in the outer regions of the retina.
Which of the following provides an example of serial (rather than parallel) processing in the visual system?
a.
Visual information is sent from the retina, to the LGN, and then to the visual cortex.
b.
Rods and cones function simultaneously in the retina.
c.
The “what” and “where” streams in the visual association cortex work together.
d.
Processing of motion and shape inform each other.
Because 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.
Chapter 12 Solutions
Human Biology: Concepts and Current Issues
Ch. 12 - Prob. 1QCCh. 12 -
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