21. Which of the following statements is not a correct description of the function of the Eustachian tube? A. Connects the throat to the middle ear B. Drains fluid from the middle ear C. Maintains equal air pressure on both sides of the eardrum D. Conducts sound waves to the eardrum 22. Which of the following statements correctly describes the process of hearing? A. The hair cells closest to the oval window detect low amplitude. B. The hair cells farthest from the oval window detect high pitch. C. The hair cells closest to the oval window detect high amplitude. D. The hair cells farthest from the oval window detect low frequency. 23. Which of the following rows correctly completes the following statement about sound transmission? The vibrating ossicles cause the oval window to vibrate; this produces pressure waves in the cochlea. This makes the A to move up and down, which causes the hair cells to bend against the B. A. A: basilar membrane, B: tectorial membrane B. A: organ of Corti, B: tectorial membrane C. A: tectorial membrane, B: basilar membrane D. A: hair cells, B: basilar membrane
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Select the incorrect statement: (a) Eustachian tube connects the middle ear cavity with the pharyn $\mathrm{x}$. (b) The eustachian tube helps in equalizing the pressure on either sides of ear drum. (c) Oval window is a part of cochlea. (d) The ear ossicle decreases the efficiency of transmission of sound waves to the inner ear.
Put these statements in correct order to understand how hearing works:
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