Textbook Question
The spiral organ sits on the ________ membrane, and the stereocilia of the outer hair cells contact the _____ membrane.
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Ch. 15 The Special Senses
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822
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Table of contents
- Ch. 1 Introduction to Anatomy and Physiology26
- Ch. 2 The Chemistry of Life38
- Ch. 3 The Cell55
- Ch. 4 Histology47
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System36
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System42
- 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 Heart30
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity45
- 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
Chapter 15, Problem 14
Explain how sounds of different frequencies are detected in the cochlea.
Verified step by step guidance1
Understand the structure of the cochlea: The cochlea is a spiral-shaped organ in the inner ear that contains the basilar membrane, which plays a key role in detecting sound frequencies. It is filled with fluid and lined with hair cells that respond to vibrations.
Learn about the basilar membrane's frequency mapping: The basilar membrane is tonotopically organized, meaning different regions of the membrane respond to different frequencies. High-frequency sounds are detected near the base of the cochlea (closer to the oval window), while low-frequency sounds are detected near the apex (the tip of the spiral).
Explore the role of hair cells: Hair cells are sensory receptors located on the basilar membrane. When sound waves cause the basilar membrane to vibrate, the hair cells in the corresponding region are stimulated. These cells convert mechanical vibrations into electrical signals.
Understand signal transmission: The electrical signals generated by the hair cells are transmitted to the auditory nerve. The auditory nerve carries these signals to the brain, where they are interpreted as specific frequencies of sound.
Connect the concept to frequency discrimination: The ability to detect different frequencies is due to the precise mechanical properties of the basilar membrane and the specific activation of hair cells in distinct regions. This allows the cochlea to act as a frequency analyzer, separating sounds into their component frequencies.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cochlea Structure
The cochlea is a spiral-shaped, fluid-filled structure in the inner ear that plays a crucial role in hearing. It contains the basilar membrane, which varies in width and stiffness along its length, allowing it to respond differently to various sound frequencies. High-frequency sounds stimulate the base of the cochlea, while low-frequency sounds affect the apex, enabling the detection of a wide range of pitches.
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Frequency Encoding
Frequency encoding in the cochlea refers to the process by which different sound frequencies are translated into neural signals. This is achieved through a mechanism called tonotopic organization, where specific areas of the basilar membrane correspond to specific frequencies. As sound waves travel through the cochlear fluid, they cause the membrane to vibrate, activating hair cells that convert these vibrations into electrical impulses sent to the brain.
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Hair Cells and Signal Transduction
Hair cells are the sensory receptors located on the basilar membrane of the cochlea. When sound vibrations cause the basilar membrane to move, the hair cells bend, leading to the opening of ion channels and the generation of electrical signals. These signals are then transmitted via the auditory nerve to the brain, where they are interpreted as sound, allowing us to perceive different frequencies.
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Related Practice
Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The cochlear duct is filled with perilymph.
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Textbook Question
How do the hair cells of the crista ampullaris detect rotation of the head?
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Textbook Question
The macula in the utricle detects:
a. Rotation of the head to the right
b. Very low-frequency sound waves that we can feel but not hear
c. Tilting of the head to one side
d. Linear acceleration of the head in a vertical plane
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Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The spiral organ is located in the scala tympani.
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Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The semicircular ducts are connected to the utricle, and the cochlear duct is continuous with the saccule.
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