BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 30, Problem 12SA
Summary Introduction
Introduction:
The eye is a sensory organ that detects the light and converts the image into electrical signals, and these signals are transferred to the visual cortex of the brain. Specialized cells called photoreceptor cells receive the light and convert it to the neural signals. The cone cells and rod cells are two different types of photoreceptors. The cone cells are responsible for colored vision, and rod cells are responsible for visualization in the presence of very less light.
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This image is of the very back of the eye. Light would be coming in from the left towards the right side.
WHich label indicates the photo receptor rod and cone cells?
A. middle layer, red and green
B. rods and cones are not in this image, they are much closer to the front of the eye ball
C. far right side, purple and yellow
D. far left side, gray
Why does rubbing your closed eyes (as you might if you’re tired or your eyes itch) produce a visual sensation?
Cone pigments detect different wavelengths of light due toa. their location in the retina.b. the amount of light they absorb.c. the type of retinal they have.d. the type of opsin protein they have.e. interactions with bipolar cells.
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Occupational Hearing Loss Frequent exposure to loud noise of a particular pitch can cause loss of hair cells in the part of the cochlea that responds to that pitch. People who work with or around noisy machinery are at risk for such frequency-specific hearing loss. Taking precautions such as using ear plugs to reduce sound exposure is important. Noise-induced hearing loss can be prevented, but once it occurs it is irreversible because dead or damaged hair cells are not replaced. FIGURE 33.11 shows the threshold decibel levels at which sounds of different frequencies can be detected by an average 25-year-old carpenter, a 50-year-old carpenter, and a 50-year-old who has not been exposed to on-the-job noise. Sound frequencies are given in hertz (cycles per second). The more cycles per second, the higher the pitch. FIGURE 33.11 Effects of age and occupational noise exposure on hearing. The graph shows the threshold hearing capacities (in decibels) for sounds of different frequencies (given in hertz) in a 25-year-old carpenter (blue), a 50-year-old carpenter (red), and a 50-year-old who did not have any on-the-job noise exposure (brown). Which sound frequency was most easily detected by all three people?
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Occupational Hearing Loss Frequent exposure to loud noise of a particular pitch can cause loss of hair cells in the part of the cochlea that responds to that pitch. People who work with or around noisy machinery are at risk for such frequency-specific hearing loss. Taking precautions such as using ear plugs to reduce sound exposure is important. Noise-induced hearing loss can be prevented, but once it occurs it is irreversible because dead or damaged hair cells are not replaced. FIGURE 33.11 shows the threshold decibel levels at which sounds of different frequencies can be detected by an average 25-year-old carpenter, a 50-year-old carpenter, and a 50-year-old who has not been exposed to on-the-job noise. Sound frequencies are given in hertz (cycles per second). The more cycles per second, the higher the pitch. FIGURE 33.11 Effects of age and occupational noise exposure on hearing. The graph shows the threshold hearing capacities (in decibels) for sounds of different frequencies (given in hertz) in a 25-year-old carpenter (blue), a 50-year-old carpenter (red), and a 50-year-old who did not have any on-the-job noise exposure (brown). How loud did a 1,000-hertz sound have to be for the 50-year-old carpenter to detect it?
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Fill in the blank:
The _______________________ of a taste cell are its sensitive part.
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Input to the human visual cortex comes from cones and rods (by way of ganglion cells) in what proportion? a. About 95 percent of input to the cortex comes from rods. b. About 50 percent comes from rods and 50 percent from cones. c. About 90 percent of input to the cortex comes from cones.
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At night, which type(s) of photopigment enable(s) you to discriminate the colors of neon signs and traffic lights?
A. Rhodopsin
B. Cone visual pigments
C. Melanopsin
D. Two of the above
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The is the region of the eye that controls the amount of light that enters.a. cornea b. pupil c. lensd. fovea
e. retina
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Of the following statements about the human eye, which would Paley agree with the most?
A. The eye has lost its purpose and it's obsolete.
B. The eye is a perfect fine-tuned machine well suited to its purpose.
C. The eye has a use, but it was not evolved for that use.
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The _______________________ can close the eye as in blinking.
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The______________ is the colored section in the eye aroundthe pupil.
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What happens when to our eyes when we go outside of the house and it is very sunny?
A.Pupil dilates as radial muscles of iris contract.
B.Pupil dilates as circular muscles of iris contract.
C.Pupil constricts as radial muscles of iris contract.
D.Pupil constricts as circular muscles of iris contract.
E.None
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Different pitched sounds will result in stimulation of receptors located in different regions of:a. hair cellsb. round and oval windowsc. the vestibular apparatusd. the cochlea
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Most sensory receptors :-a- are stimulated by different types of stimulib- are stimulated only by specific stimulic- posses a high threshold for their specific stimulid- only ‘b’ and ‘c’ are correct
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