Review Questions Chapter 11 Answer Key

Review Questions Chapter 11 Answer Key - Review Questions...

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Review Questions Chapter 11 Answer Key From Textbook 1. How is the conduction of sound to the cochlea facilitated by the ossicles of the middle ear? The ossicles amplify the pressure. The fluid in the inner ear resists movement more than air does, so greater pressure is needed to vibrate the fluid. The surface area of the oval window is smaller than that of the tympanic membrane, and the force is greater at the oval window than at the tympanic membrane because the ossicles act as levers. Because of these two mechanisms, the pressure at the oval window is about 20 times greater than the pressure at the tympanic membrane. This increase in pressure is sufficient to move the fluid in the inner ear. 2. Why would the transduction process in hair cells fail if the stereocilia as well as the hair cell bodies were surrounded by perilymph? Endolymph, which is similar to intracellular fluid, surrounds stereocilia and hair cell bodies. It has a high K + concentration and a low Na + concentration. The high K + concentration is responsible for a K
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Review Questions Chapter 11 Answer Key - Review Questions...

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