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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Students have asked these similar questions
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.
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 statements about the contributions of rods and cones to vision is TRUE?
A.
The three types of cones (long, medium, short) are represented at roughly equal numbers
B.
Rods respond to light at ultra-violet wavelengths (>600nm)
C.
The relative density of cones is roughly even throughout the retina
D.
The greater sensitivity of rods in low light is explained by their larger number
E.
Several rods converge on a single bipolar cell
Chapter 12 Solutions
Human Biology: Concepts and Current Issues
Ch. 12 - Prob. 1QCCh. 12 -
2. Should the use of all hand-held devices,...Ch. 12 - Do you approve of the law in five states that a...Ch. 12 -
1. List the five classifications of receptors in...Ch. 12 - Prob. 2CRCh. 12 -
3. Describe what information the somatic...Ch. 12 - Name the five special senses.Ch. 12 - Compare and contrast fast pain, slow pain, and...Ch. 12 - Prob. 6CRCh. 12 - Prob. 7CR
Ch. 12 - Prob. 8CRCh. 12 - Prob. 9CRCh. 12 - Prob. 10CRCh. 12 - What do the receptors in the skin for light touch...Ch. 12 - Prob. 2TYCh. 12 - Prob. 3TYCh. 12 - Receptor adaptation results when: a. sensory...Ch. 12 - Prob. 5TYCh. 12 - Different pitched sounds will result in...Ch. 12 - Prob. 7TYCh. 12 - Prob. 8TYCh. 12 - Prob. 9TYCh. 12 - Prob. 10TYCh. 12 - Prob. 11TYCh. 12 - Prob. 12TYCh. 12 - Prob. 13TYCh. 12 - Prob. 14TYCh. 12 - Which of the following can be corrected with...Ch. 12 - With the eyes closed, would an astronaut in outer...Ch. 12 - Why do you suppose that you are not normally aware...Ch. 12 - Prob. 3AWKCh. 12 - Prob. 4AWKCh. 12 - Prob. 5AWKCh. 12 - Prob. 6AWKCh. 12 - Prob. 7AWK
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Which 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_forwardIf someone is born with dense cataracts on both eyes, and the cataracts are removed years later, what happens?A. The person remains permanently blind.B. The person gradually recovers all aspects of vision.C. The person gains some vision, but remains impaired on object recognition, motion vision, and depth perception.D. The person gains almost all aspects of vision, but remains greatly impaired on color perception.arrow_forwardWhat is the X-shaped structure that sits just below the brain’s ventral surface and represents the merging of the optic nerves from the two eyes? A) lens B) optic chiasm C) fovea D) irisarrow_forward
- Why is it easier to see images at night using peripheral, rather than the central, vision? a. Cones are denser in the periphery of the retina. b. Bipolar cells are denser in the periphery of the retina. c. Rods are denser in the periphery of the retina. d. The optic nerve exits at the periphery of the retina.arrow_forwardPresbyopia is a condition in which a person loses part or all of their capacity to adapt to changes in visual acuity. Will she still need reading glasses after having LASIK to fix her far vision? Explain.arrow_forwardAt each level of the retina-geniculate-striate system, receptive fields in the foveal area are ___ than those at the periphery Select one: a. both smaller and rounder, for the reasons mentioned in each respective option b. larger, since the fovea mediates low acuity vision c. smaller, since the fovea mediates high acuity vision d. rounder, the receptive fields in the periphery tend to be more square-shapedarrow_forward
- You are watching the stars at night, and you never seem to be looking at the right spot to catch the brightest meteors. Which of the following might explain this? a)Your fovea contains mostly cones; thus you see dim light especially well when looking right at it. b)Your peripheral retina contains more rods, which are more sensitive to dim light than cones; thus objects in your peripheral vision appear brighter in dim light situations. c)Detection of light depends mostly on its color rather than intensity; thus cones play a larger role in detection of light in dim light situations. d) all of the above. ( well explain the correct answer and type answer).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_forwardWhy do rods provide greater visual sensitivity while cones provide better acuity?arrow_forward
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