Human Anatomy
9th Edition
ISBN: 9780135168059
Author: Marieb, Elaine Nicpon, Brady, Patricia, Mallatt, Jon
Publisher: Pearson Education, Inc.,
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Question
Chapter 16, Problem 5CRCAQ
Summary Introduction
To review:
The cause of blindness of premature babies who were born before 25 weeks after conception.
Introduction:
The outermost covering of the eye is known as sclera and the cornea. The cornea forms a dome-shaped structure at the front side of the eye. The inner layer of the eye is the retina that includes rod and cone photoreceptor cells. These cells provide vision at different intensities of light. Various types of disorders are associated with vision and some of them are related to age while others are related to other reasons. Some of the common disorders that are associated with visualization are cataract, glaucoma, and some other conditions that are associated with accommodation.
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Ming, a student in optometry school, felt very sad when she saw some premature babies at the hospital who were born before 25 weeks after conception. She knew that many of these children would soon be blind for life. Explain why.
If you had been born without cone cells in your eyes, would you still be able to see? Explain.
Even though they are located in the back of the retinal tissue, what is the importance of the rod and cone photoreceptor cells to our sense of sight?
Chapter 16 Solutions
Human Anatomy
Ch. 16 - Prob. 1CYUCh. 16 - What type of cell are the olfactory receptors?...Ch. 16 - Prob. 3CYUCh. 16 - What muscle is not functioning in a person whose...Ch. 16 - Prob. 5CYUCh. 16 - Prob. 6CYUCh. 16 - Prob. 7CYUCh. 16 - Prob. 8CYUCh. 16 - Prob. 9CYUCh. 16 - Prob. 10CYU
Ch. 16 - Prob. 11CYUCh. 16 - Prob. 12CYUCh. 16 - Prob. 13CYUCh. 16 - Which auditory ossicle abuts the tympanic...Ch. 16 - Prob. 15CYUCh. 16 - Prob. 16CYUCh. 16 - Prob. 17CYUCh. 16 - Prob. 18CYUCh. 16 - What type of deafness results from damage to the...Ch. 16 - Prob. 20CYUCh. 16 - What brain regions receive input from the...Ch. 16 - Prob. 1RQCh. 16 - Prob. 2RQCh. 16 - The transmission of sound vibrations through the...Ch. 16 - Of the neurons in the retina, which form the optic...Ch. 16 - Blocking the scleral venous sinus might result in...Ch. 16 - Conduction of sound from the middle ear to the...Ch. 16 - The structure that allows the air pressure in the...Ch. 16 - The receptors for static equilibrium that report...Ch. 16 - Paralysis of a medial rectus muscle would affect...Ch. 16 - Prob. 10RQCh. 16 - The optic disc is the site where (a) more rods...Ch. 16 - Prob. 12RQCh. 16 - Prob. 13RQCh. 16 - (a) What is the precise location of the olfactory...Ch. 16 - Prob. 15RQCh. 16 - Name two special senses whose receptor cells are...Ch. 16 - (a) Describe the embryonic derivation of the...Ch. 16 - Prob. 18RQCh. 16 - Prob. 19RQCh. 16 - Compare and contrast the functions of the interior...Ch. 16 - (a) What is the difference, if any, between a...Ch. 16 - Prob. 22RQCh. 16 - Prob. 1CRCAQCh. 16 - Prob. 2CRCAQCh. 16 - Dr. Nakvarati used an instrument to blow a puff of...Ch. 16 - Lionel suffered a ruptured artery in his middle...Ch. 16 - Prob. 5CRCAQCh. 16 - Prob. 6CRCAQCh. 16 - Prob. 7CRCAQ
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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_forwardWhy do we detect faint light more effectively in the periphery of the retina than in the fovea?arrow_forwardWhy do rods provide greater visual sensitivity while cones provide better acuity?arrow_forward
- Which structure gives rise to the neural and pigmented layers of the retina?arrow_forwardWhy is it difficult to see colors in dim light?arrow_forwardWhich is the part of thehuman visual system wherethe receptors that sense light,i.e., the photoreceptor cells,are located? How do thosecells work?arrow_forward
- Light from the left side of the world strikes the ___________ side of the retina, while light from the right side of the world strikes the ___________ side of the retina. Top, Bottom Bottom, Top Left, Right Right, Leftarrow_forwardIn attempting to discern distant details, people will sometimes squint. Why does this help?arrow_forwardWhy doesn't the blind spot interfere with our normal vision?arrow_forward
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