Essentials of Human Anatomy & Physiology (12th Edition)
12th Edition
ISBN: 9780134395326
Author: Elaine N. Marieb, Suzanne M. Keller
Publisher: PEARSON
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Chapter 8, Problem 42CT
Julie and her father love to find the constellations in the sky on starry nights. One evening, Julie came running into the house and whispered excitedly to her mother. “Mom, I’ve got power! When I look hard at a star it disappears!” What is happening?
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Chapter 8 Solutions
Essentials of Human Anatomy & Physiology (12th Edition)
Ch. 8 - Prob. 1MCCh. 8 - Alkaloids excite gustatory hairs mostly at the a....Ch. 8 - Prob. 3MCCh. 8 - Which cranial nerve controls contraction of the...Ch. 8 - The cornea is nourished by a. corneal blood...Ch. 8 - When the eye focuses for far vision, a. the lens...Ch. 8 - Convergence a. requires contraction of the medial...Ch. 8 - 8. Which of the following are paired...Ch. 8 - Movement of the ______ membrane triggers bending...Ch. 8 - 10. Sounds entering the external acoustic meatus...
Ch. 8 - Prob. 11SAECh. 8 - Prob. 12SAECh. 8 - 13. Diagram and label the internal structures of...Ch. 8 - Prob. 14SAECh. 8 - Prob. 15SAECh. 8 - 16. What is the blind spot, and why is it so...Ch. 8 - What name is given to the structure that controls...Ch. 8 - What is the fovea centralis, and why is it...Ch. 8 - 19. Trace the pathway of light from the time it...Ch. 8 - Prob. 20SAECh. 8 - 21. Define hyperopia, myopia, and emmetropia.
Ch. 8 - Prob. 22SAECh. 8 - Prob. 23SAECh. 8 - Prob. 24SAECh. 8 - Many students struggling through mountains of...Ch. 8 - Prob. 26SAECh. 8 - Prob. 27SAECh. 8 - Prob. 28SAECh. 8 - Prob. 29SAECh. 8 - Prob. 30SAECh. 8 - Prob. 31SAECh. 8 - Prob. 32SAECh. 8 - Prob. 33SAECh. 8 - Which special sense requires the most learning?Ch. 8 - 35. For each of the following descriptions,...Ch. 8 - An engineering student has been working in...Ch. 8 - Prob. 37CTCh. 8 - Prob. 38CTCh. 8 - Brandon suffered a ruptured artery in his middle...Ch. 8 - Prob. 40CTCh. 8 - Prob. 41CTCh. 8 - 42. Julie and her father love to find the...Ch. 8 - Prob. 43CTCh. 8 - 44. Mrs. Garson has an immune disorder that causes...Ch. 8 - Prob. 45CTCh. 8 - Explain the role of vitamin A in vision.
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- You are watching the stars at night, and you never seem to be looking at the right spot to catch the brightest meteors. Which of the following might explain this? a)Your fovea contains mostly cones; thus you see dim light especially well when looking right at it. b)Your peripheral retina contains more rods, which are more sensitive to dim light than cones; thus objects in your peripheral vision appear brighter in dim light situations. c)Detection of light depends mostly on its color rather than intensity; thus cones play a larger role in detection of light in dim light situations. d) all of the above. ( well explain the correct answer and type answer).arrow_forwardWhen a person blinks, the part of the brain that interprets visual stimulation is suppressed. The spontaneous act of blinking is controlled by the area of the brain that controls involuntary movements such as breathing and blood pressure. To determine whether the lack of light or the act of blinking causes the suppression, scientists had subjects close their eyes and then placed a bright flashing light in their mouth to stimulate the photoreceptors in the eyes through the palate. Visual stimulation was still suppressed. So the photoreceptors in the retina were not stimulated even though they were exposed to light. This study demonstrated that when a person blinks, it is the act of blinking and not the absence of light that causes the suppression of visual stimulation. In the diagram above, identify the part of the brain that is suppressed during blinking and the part of the brain that controls involuntary, spontaneous blinking. Select one: a. 3 and 8 b. 2 and 9 c. 5 and 6 d. 1…arrow_forwardWhy is it difficult to see colors in dim light?arrow_forward
- How can I read those volume ?arrow_forwardA person’s eyes are perfect but they are completely blind. How is this possiblearrow_forwardIn 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.arrow_forward
- Grandpa can't ever seem to hear what his little granddaughters say. He also can't hear that high-pitched whine in the Subaru engine that everyone else seems to hear. You suspect that grandpa has too much ear wax built up in his external auditory canal, and therefore has developed conduction deafness has damage to the vestibulocochlear nerve has damaged either the utricle or the saccule, though it will be hard to tell which one without further testing has damaged the hair cells closest to the oval window has "selective" hearing loss, because the granddaughters are always trying to get him to play with them when he's tired, and he doesn't want to work on that darned car anymore either.arrow_forwardMilo and Garfield are two friends who have acquired hearing loss, but the cause of hearing loss in Milo is different from that in Garfield. Milo has a conductive hearing loss. He can hear, but not clearly and loudly. The doctor has told Milo that calcium has built up on the bones in his middle ear interfering with their movements. Garfield has neural hearing loss. The doctor has told Garfield that he cannot hear because the auditory nerve cannot transmit electrical impulses from receptors in his inner ear to his brain. By completing the following tasks, help Milo and Garfield understand how their ear works and why they have difficulty hearing sounds. E. Draw and label a diagram showing the position of the bones in the middle ear. F. Explain the function of the bonesinconducting sound. G. Draw and label a diagram showing the inner ear, the position of receptors and the auditory nerve.arrow_forwardMing, 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.arrow_forward
- Shandra is a 38-year-old Dentist Aide, who recently suffers with numbness in her hands and tingling in her toes. To her knowledge she has no medical conditions and never bothered to check. Six-months ago, she noticed that her vision is a bit blurred, sometimes she may have floating clouds in her vision that are not actually there which usually clear on its own. Shandra is five feet four inches and weighs 170 lbs, medium-frame built but an apple-shaped body-type. She is not physically active and seldom cooks during the working-week. Last Tuesday Shandra visited the doctor, she was ordered to return in two days to complete and OGT and a glycated haemoglobin test (GHT). (iv) What is the bodily system that is affected and could be affected if not resolved? (v) Additionally, a urine test was completed on the initial day of testing, the results all parameters in normal ranges as well as low levels of ketones, what does this indicate? (vi) What are other possible risk factors, signs and/or…arrow_forwardShandra is a 38-year-old Dentist Aide, who recently suffers with numbness in her hands and tingling in her toes. To her knowledge she has no medical conditions and never bothered to check. Six-months ago, she noticed that her vision is a bit blurred, sometimes she may have floating clouds in her vision that are not actually there which usually clear on its own. Shandra is five feet four inches and weighs 170 lbs, medium-frame built but an apple-shaped body-type. She is not physically active and seldom cooks during the working-week. Last Tuesday Shandra visited the doctor, she was ordered to return in two days to complete and OGT and a glycated haemoglobin test (GHT).Questions to be answered (i) Summarize the OGT and GHT process and discuss the physiological expectations of these test? (ii) What is the illness/disease that the doctor is trying to rule out? Be sure to classify and give physiological explanations. (iii) What are Shandra’s modifiable risk factors?arrow_forwardThe order in which the cells in the eye process light is __________. A) photoreceptors; ganglion cells; bipolar cells B) ganglion cells; bipolar cells; photoreceptors C) photoreceptors; bipolar cells; ganglion cells D) bipolar cells; photoreceptors; ganglion cellsarrow_forward
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Visual Perception – How It Works; Author: simpleshow foundation;https://www.youtube.com/watch?v=DU3IiqUWGcU;License: Standard youtube license