Human Physiology
15th Edition
ISBN: 9781259864629
Author: Fox, Stuart Ira
Publisher: Mcgraw-hill Education,
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Question
Chapter 10, Problem 41RA
Summary Introduction
To review:
1. The variations in the observation of a dim star under different viewing conditions.
2. The reason behind the ability to continue to observe an object in daylight.
Introduction:
The human retina contains photoreceptors called rod and cone cells. These cells are responsible for dim and bright vision, respectively. They have the capability to absorb the light and then transform this light into electrical signals. The signals can cause a change in the potential of the membrane and lead to visual phototransduction.
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In order to see a dim star at night, it is better not to look directly at it. If you see it from the “corner of your eye” and then turn to look at it, it may disappear. Explain how this occurs. Also, you can staredirectly at an object in daylight and continue seeing it, despite the bleaching of photoreceptors. Explain how this is possible.
A scientist has dissected out a small section of the retina and is able to directly record the action potential firing rate in a single ganglion cell.
Assume there is a on-center off-surround bipolar cell connected to an on-center off-surround ganglion cell.
When applying ‘Stimulus 1’ the scientist records a moderate action potential rate. When applying ‘Stimulus 2’ the rate of action potentials increases substantially.
In the context of this experiment no illumination is an option as a 'Stimulus'.
‘Stimulus 2’ would result in what response in the bipolar cell (the one connected to the ganglion cell the scientist is measuring)?
A. A large depolarization of the bipolar cell membrane
B. The bipolar cell membrane would remain at the resting membrane potential
C. A large hyperpolarization of the bipolar cell membrane
D. A small hyperpolarization of the bipolar cell membrane
E. A small depolarization of the bipolar cell membrane
In a detailed essay, Explain 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 process are taking place (i.e rods, bipolar cells or ganglion cells, outer segment, inner segment...).
Please provide step-by-step details! please be sure you add all required info.
Chapter 10 Solutions
Human Physiology
Ch. 10 - Prob. 1aCPCh. 10 - Prob. 1bCPCh. 10 - Prob. 1cCPCh. 10 - Prob. 2CPCh. 10 - Prob. 3CPCh. 10 - Define the term sensory acuity and explain how...Ch. 10 - Prob. 4bCPCh. 10 - Prob. 5CPCh. 10 - Prob. 6CPCh. 10 - Prob. 7aCP
Ch. 10 - Describe the structure of the semicircular canals...Ch. 10 - Prob. 8CPCh. 10 - Prob. 9CPCh. 10 - Prob. 10CPCh. 10 - Prob. 11CPCh. 10 - Using a line diagram, show how parallel rays of...Ch. 10 - Prob. 13CPCh. 10 - Describe the layers of the retina and trace the...Ch. 10 - Prob. 14bCPCh. 10 - Describe the electrical state of photoreceptors in...Ch. 10 - Prob. 16aCPCh. 10 - Prob. 16bCPCh. 10 - Prob. 17CPCh. 10 - Describe the way in which ganglion cells typically...Ch. 10 - How can the arrangement of the receptive fields of...Ch. 10 - Describe the stimulus requirements of simple...Ch. 10 - Prob. 1RACh. 10 - Match the vestibular organ on the left with its...Ch. 10 - Prob. 3RACh. 10 - Prob. 4RACh. 10 - Prob. 5RACh. 10 - Cutaneous receptive fields are smallest in a. the...Ch. 10 - Prob. 7RACh. 10 - The receptors for taste are
a. naked sensory...Ch. 10 - Prob. 9RACh. 10 - Prob. 10RACh. 10 - Prob. 11RACh. 10 - Glasses with concave lenses help correct a....Ch. 10 - Prob. 13RACh. 10 - A bar of light in a specific part of the retina,...Ch. 10 - Prob. 15RACh. 10 - Prob. 16RACh. 10 - Prob. 17RACh. 10 - Epithelial cells release transmitter chemicals...Ch. 10 - Explain what is meant by lateral inhibition and...Ch. 10 - Prob. 20RACh. 10 - Prob. 21RACh. 10 - Explain the relationship between smell and taste....Ch. 10 - Prob. 23RACh. 10 - Prob. 24RACh. 10 - Prob. 25RACh. 10 - Describe the sequence of changes that occur during...Ch. 10 - Prob. 27RACh. 10 - Prob. 28RACh. 10 - Prob. 29RACh. 10 - Prob. 30RACh. 10 - Describe the receptive fields of retinal ganglion...Ch. 10 - Prob. 32RACh. 10 - Discuss the different functions of the pigment...Ch. 10 - Prob. 34RACh. 10 - Prob. 35RACh. 10 - People with conduction deafness often speak...Ch. 10 - Prob. 37RACh. 10 - Prob. 38RACh. 10 - Discuss the role that inertia plays in the...Ch. 10 - Prob. 40RACh. 10 - Prob. 41RACh. 10 - Prob. 42RACh. 10 - Prob. 43RACh. 10 - Prob. 44RACh. 10 - Prob. 45RACh. 10 - Prob. 46RA
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- Larry goes to the doctor complaining that he cant see the right side of the visual field with either eye. Where in the visual signal-processing pathway is Larrys problem occurring?arrow_forwardWhen light hits the center of an ON-center receptive field, which of the following processes occur: a. Photoreceptors release more glutamate; bipolar cells release more glutamate; retinal ganglion cells decrease rate of APs. b. Photoreceptors release less glutamate; bipolar cells release less glutamate; retinal ganglion cells decrease rate of APs. c. Photoreceptors release less glutamate; bipolar cells release more glutamate; retinal ganglion cells increase rate of APs. d. Photoreceptors release more glutamate; bipolar cells release more glutamate; ganglion cells increase rate of APs.arrow_forwardWhat is the shape of a receptive field of a simple cell in the primary visual cortex?A. Either a bar or an edge, in a fixed positionB. Either a bar or an edge, anywhere within a large area of the retinaC. Either a bar or an edge, with a strong inhibitory field at one endD. A circle, with a surround that responds in the opposite wayarrow_forward
- Under normal visual circumstances, explain why small objects are not lost from our vision.arrow_forwardPlease fill in the table to summarize the differences between central and peripheral vision. Vision within the fovea centralis is called central vision while vision outside the fovea is called peripheral vision.arrow_forwardExplain the normal functioning of the eye to allow us to have visual acuity. What is meant by visual acuity? How does the eye adjust to facilitate this? Specifically, how do changes in near-point accommodation and astigmatism affect acuity? What is the problem with changes in near-point accommodation and astigmatism and why are they problematic? How can each of these be measured? Can these conditions be corrected? If so, how? Do these conditions change as we age?arrow_forward
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