Textbook Question
Mr. Spencer suffers loss of taste sensation. Tests reveal that his taste buds and salivary glands are functional. What other structures might be impaired that would explain his loss of taste?
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Ch. 15 The Special Senses
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814
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Table of contents
- Ch. 1 Introduction to Anatomy and Physiology24
- Ch. 2 The Chemistry of Life37
- Ch. 3 The Cell54
- Ch. 4 Histology46
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System35
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System41
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart28
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity41
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Not the one you use?Change textbook
Chapter 15, Problem L3.2
Your friend tells you that she has just been diagnosed with myopia, and she wonders if staring at her computer screen too much might have caused her problem. What do you tell her?
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Explain to your friend that myopia, also known as nearsightedness, is a condition where the eye focuses light in front of the retina instead of directly on it, making distant objects appear blurry.
Discuss the primary causes of myopia, which include genetic factors and environmental influences such as prolonged close-up activities (e.g., reading, using a computer, or looking at a phone screen). These activities can contribute to eye strain and potentially worsen myopia over time.
Clarify that staring at a computer screen for extended periods does not directly cause myopia but may exacerbate symptoms or lead to digital eye strain, which can mimic or worsen discomfort associated with myopia.
Advise your friend to practice good eye care habits, such as following the 20-20-20 rule (looking at something 20 feet away for 20 seconds every 20 minutes) to reduce eye strain and taking regular breaks from screen time.
Encourage your friend to consult an optometrist or ophthalmologist for personalized advice and treatment options, such as corrective lenses or lifestyle adjustments, to manage her myopia effectively.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Myopia
Myopia, or nearsightedness, is a common refractive error where distant objects appear blurry while close objects can be seen clearly. It occurs when the eyeball is too long or the cornea has too much curvature, causing light rays to focus in front of the retina. Understanding myopia is essential to address concerns about its causes and management.
Digital Eye Strain
Digital eye strain, also known as computer vision syndrome, refers to a group of eye and vision-related problems that result from prolonged use of digital devices. Symptoms include dry eyes, blurred vision, and discomfort. While it does not directly cause myopia, excessive screen time can exacerbate existing vision issues and lead to discomfort.
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Preventive Eye Care
Preventive eye care involves practices aimed at maintaining eye health and preventing vision problems. This includes regular eye exams, proper lighting while using screens, and the 20-20-20 rule, which suggests taking a 20-second break to look at something 20 feet away every 20 minutes. Educating your friend about these practices can help manage her myopia and reduce eye strain.
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Related Practice
Textbook Question
Suppose the round window in your middle ear became very stiff. What effect would this have on hearing, and why?
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Textbook Question
If severe congestion from a cold prevented your pharyngotympanic tube from opening, what could happen to your tympanic membrane? Explain your answer.
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Textbook Question
Your 60-year-old patient, Mr. Guster, has Bell's palsy, which causes dysfunction of those portions of the facial nerve that control muscles of facial expression. He is surprised when you tell him to tape the eyelids of his right eye closed at night to prevent dryness. Why might Bell's palsy cause dryness of the eye on the affected side?
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Textbook Question
In an olfactory neuron, the binding of a(n) ______ to its membrane receptor triggers a(n) _______ potential in the axons of the ______ nerve.
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Textbook Question
Mrs. Flores is a 45-year-old female who suffered a fracture of the ethmoid bone as the result of a car accident. Several days later, she complained that she couldn't taste her food very well. How is her injury related to the loss of taste sensation?
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