Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 50, Problem 9TYU
WRITE ABOUT A THEME: ORGANIZATION In a short essay (100–150 words), describe three ways in which the structure of the lens of the human eye is well adapted to its function in vision.
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In a short essay (100–150 words), describe three ways in which the structure of the lens of the human eye is well adapted to its function in vision.
Recall that the eye is composed of three layers or "tunics" — the fibrous, vascular, and nervous layers — which enclose two cavities that are separated from each other by the lens. Review the components of these three layers by matching each description with the appropriate letter in the figure below:
1. Fluid in the anterior portion of the eye that provides nutrients to the lens and cornea
2. The "whites" of the eye
3. Area of the retina that lacks photoreceptors
4. Contains smooth muscle that controls the shape of the lens
5. Nutritive (nourishing) layer of the eye
6. Layer containing rods and cones
7. Gel-like substance that helps support the eyeball
8. Pigmented smooth muscles that control pupil size
9. Most anterior component of the fibrous layer — your "window to the world"
10. Structure that changes shape to bend light toward rods and cones
Provide a step by step list of visual sensation through visual processing. Begin at light entering the
eye through signal transduction, to the circuitry involved in the brain in understanding the "what"
and "where" of the object. Be sure to review the specific criteria outlined in the rubric.
Chapter 50 Solutions
Campbell Biology
Ch. 50.1 - Prob. 1CCCh. 50.1 - Prob. 2CCCh. 50.1 - Prob. 3CCCh. 50.2 - How are otoliths adaptive for burrowing mammals,...Ch. 50.2 - Prob. 2CCCh. 50.2 - Prob. 3CCCh. 50.2 - Prob. 4CCCh. 50.3 - Contrast the light-detecting organs of planarians...Ch. 50.3 - Prob. 2CCCh. 50.3 - Prob. 3CC
Ch. 50.3 - Prob. 4CCCh. 50.4 - Explain why some taste receptor cells arid all...Ch. 50.4 - Prob. 2CCCh. 50.4 - Prob. 3CCCh. 50.5 - Contrast the role of Ca2+ in the contraction of a...Ch. 50.5 - Prob. 2CCCh. 50.5 - Prob. 3CCCh. 50.6 - Contrast swimming and flying in terms of the main...Ch. 50.6 - MAKE CONNECTIONS. Peristalsis contributes to the...Ch. 50.6 - WHAT IF? When using your arms to lower yourself...Ch. 50 - Sensory receptors transduce stimulus energy and...Ch. 50 - How are music volume and pitch encoded in signals...Ch. 50 - Prob. 50.3CRCh. 50 - Prob. 50.4CRCh. 50 - What are two major functions of ATP hydrolysis in...Ch. 50 - Which of the following sensory receptors is...Ch. 50 - The middle ear converts (A) air pressure waves to...Ch. 50 - Prob. 2TYUCh. 50 - Prob. 3TYUCh. 50 - Prob. 4TYUCh. 50 - Although some sharks close their eyes just before...Ch. 50 - Prob. 6TYUCh. 50 - EVOLUTION CONNECTION In general, locomotion on...Ch. 50 - Prob. 8TYUCh. 50 - WRITE ABOUT A THEME: ORGANIZATION In a short essay...Ch. 50 - SYNTHESIZE YOUR KNOWLEDGE Bloodhounds, which are...Ch. 50 - If an egg rolls out of the nest, a mother greylag...
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- Review how photoreceptors within the eye detect light and transmit that information to the brain, by identifying each lettered structure in the figure below and answering the questions that follow: A: B: C: D: E: F: G: Which structure responds to color?: Which structure responds to dim light and movement?: Which two structures release neurotransmitters in response to light?: Which structure binds to those neurotransmitters, relays an action potential, and releases a second set of neurotransmitters?: Which structure binds to this second set of neurotransmitters and relays an action potential through the optic nerve to the brain?: Which direction does light travel through the retina? Toward the choroid or away?: Which direction do neural signals travel through the retina? Toward the choroid or away?:arrow_forwardUse these 2 terms to describe how light is focused 1. During distant vision: 2. During close vision What are the 2 layers of the retina? Function?arrow_forwardHow do we perceive stimuli in everyday life. Describe this pathway (do not list) for vision OR olfaction using the key words listed below. (Note: Be sure you can do this for sound and balance too) Start with the stimulus and end with its perception in the cortex. (Note: words are in no particular order). Key words for vision: photoreceptor, retina, light, visual cortex, optic nerve (CN II), action potentials, optic chiasm, optic tract, LGN of thalamus, “I see light!” Key words for olfaction: odorant, olfactory receptor cell, olfactory nerve (CN I), g-proteins, olfactory bulb, olfactory tract, olfactory cortex, action potentials, odor molecules. “I smell coffee!”arrow_forward
- List the optical components of the eye and state the role of each one in the formation of an image?arrow_forwardUsing a line diagram, show how parallel rays of light are brought to a focus on the retina. Explain how this focus is maintained as the distance from the object to the eye is increasedor decreased (that is, explain accommodation).arrow_forwardExplain why different types of receptor cells and neural circuits are required for day and night vision.arrow_forward
- Please give answer What are the roles of the cornea, the iris, the pupil, and the lens in human vision?arrow_forwardExplain how we form visual images and distinguish colors, and discuss how the central nervous system processes visual information.arrow_forwardThe primary function of the lens of the eye is to: Question 7 options: Provide protection across the front of the eye Adjust the shape of the pupil Focus the visual image onto the optic disc Focus the visual image onto the fovea centralisarrow_forward
- Mention any five characteristics of the human eye that enable it to capture images in the real world.arrow_forwardThe function of the vertebrate eye is unusual compared with other processes found within the body. For example, the direction in which sensory information flows is actually opposite to the path that light takes through the retina. Explain the sequence of events involved in the movement of light and information through the structures of the eye and explain why they move in opposite directions. Compare this sequence to the functioning of the Mollusk eye.arrow_forwardExplain the process of phototransduction and signal transmission in the retina. Be sure to include the steps associated with the formation/breakdown of Rhodopsin as well as the signal transduction process that takes place in the retina beginning in the dark. Be sure to also include where in the retina these processes are taking place (i.e rods, bipolar cells or ganglion cells, outer segment, inner segment…). It is a very important question If possible, provide all the correct and detailed information, please.arrow_forward
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