Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Textbook Question
Chapter 44, Problem 7TY
In the mammalian eye, light from near or far objects is focused on the retina when
- a. the lens moves forward or backward.
- b. the lens rounds up or flattens.
- c. the eyeball changes shape.
- d. the cornea changes shape.
- e. the retina changes shape.
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Vision is a complex process. The human eye has many structures that contribute to vision. Which of the following statements describing the structures involved in the process of vision is NOT correct?
a. Ciliary muscles change the shape of the lens to focus both near and distant objects.
b. The cornea and lens bend light to focus the image on the retina.
c. The iris relaxes and contracts to protect the retina from excess light.
d. Lenses move forward or backward to control the amount of light striking the retina.
Occlusion is
a. the condition in which object properties don’t change when viewed from different angles.
b. the idea that numerous physical stimuli can create the same image on the retina.
c. when one object partially covers another.
d. when the stimulus on the receptors is ambiguous.
Which 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.
Chapter 44 Solutions
Biology
Ch. 44.1 - Prob. 1CSCh. 44.2 - Prob. 1CCCh. 44.2 - Prob. 1CSCh. 44.2 - Prob. 2CCCh. 44.2 - Prob. 2CSCh. 44.2 - Prob. 3CCCh. 44.4 - Prob. 1CCCh. 44.5 - Prob. 1CSCh. 44.5 - Why is red-green color blindness rare in females?Ch. 44.5 - Prob. 2CS
Ch. 44.5 - Prob. 2CCCh. 44.6 - Prob. 1EQCh. 44.6 - CoreSKILL Of the two hypotheses explaining how...Ch. 44.6 - Prob. 3EQCh. 44.6 - Prob. 1CCCh. 44 - The process in which incoming sensory stimulation...Ch. 44 - Prob. 2TYCh. 44 - ______blanksense pain; ______blank sense heat or...Ch. 44 - Prob. 4TYCh. 44 - In which process(es) are hair cells involved? a....Ch. 44 - Prob. 6TYCh. 44 - In the mammalian eye, light from near or far...Ch. 44 - Prob. 8TYCh. 44 - Prob. 9TYCh. 44 - The stimulation for olfaction involves odorant...Ch. 44 - Prob. 1CQCh. 44 - Prob. 2CQCh. 44 - Prob. 3CQCh. 44 - Discuss the several types of sensory stimuli that...Ch. 44 - Prob. 2COQ
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- Colour blindness can result from the loss of specific types of cones, or it can occur in individuals having fewer cones of a given type. An individual has 50% less than the normal number of green cone photoreceptors in his or her retina. How would this affect his or her vision? a. This person has night blindness. He or she should start to eat more carrots to replenish the stock of retinal molecules in the retina. b. This person will have difficulty adapting to varying light levels. His or her cone receptors take much longer to adapt in a brightly lit area. c. This person does not have a colour blindness because no green cone photoreceptors are in the retina; only red, yellow, and blue photoreceptors exist. d. This person has a mild green colour blindness. He or she cannot see green colours very clearly and has difficulty distinguishing colours involving green hues.arrow_forwardHyperopia is a condition in which the eye cannot view close objects clearly. Many newborns have hyperopia. Compared to older adults, the lenses of a newborn baby are very light and flexible. Hyperopia in newborn babies is caused by a. the inability of the iris to adjust to changing light conditions b. uneven curvature of the cornea c. loss of lens flexibility d. weak ciliary muscles that do not pull adequately on the lensarrow_forwardWhich one of the following statements about photoreception is true? a. Light detection is initiated by the absorbance of light (a photon) by a photopigment molecule. b. Light detection is synonomous with vision. c. Light detection is always initiated in a rod photoreceptor located in the retina. d. Only light in the visible range (between 400 and 700 nm wavelength) can be detected by animals. e. None of the above answer choices (neither A, nor B, nor C, nor D) is true.arrow_forward
- Myopia is a condition in which a person has Select one: a. light rays focusing in front of the retina due to a flattened cornea b. light rays focusing in front of the retina due to a short eyeball c. light rays focusing in front of the retina due to a cornea that is too curved d. light rays focusing in front of the retina due to a detached retinaarrow_forwardWhen you exit a dark room into a brightly lit environment, within seconds, you to see a crisp view of your surroundings. However, when you enter a dark room from a brightly lit environment, your eyes might take more than 10 minutes to become used to the new surroundings. Your eyes are waiting for: a. the rods to begin to function b. the cones to begin to function c. the pupils to get smallerarrow_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_forward
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