Question

1. the part of the ear that has been damaged in an individual with nerve deafness is/are the

a. narrow passage way of the eustachian tube
b. hair cells of the organ of corti
c. hammer, anvil, and stirrup
d. otoliths of the utricle and saccule
hint: note that in these two questions only one word has been changed in the stem of the question. try to read very critically, locating concept words (nerve or conduct) and logic words (part of the ear).

1. balance and co - ordination are detected by all the following except

a. organ of corti
b. semi - circular canals
c. proprioceptors
d. utricle and saccule

1. after pressure waves in the fluid of the cochlea are generated, the pressure moves

a. the stereocilia of the hair cells up and down against the oval window
b. the stereocilia of the hair cells up and down against the round window
c. the basilar membrane up and down causing the stereocilia of the hair cells to bend against the tectorial membrane
d. the tectorial membrane up and down causing the stereocilia of the hair cells to bend against the basilar membrane.
hint: a major idea: the “hair cells” synapse (are connected) to auditory neurons that go the the temporal lobe of the cerebral cortex for inspection.
it is difficult to say how much detail will be required in future exams. know the basics: hair cells, organ of corti, organ of hearing, are found in the cochlea.

Explanation:

1. Question 37: Nerve deafness often results from damage to the hair - cells of the organ of Corti. These hair - cells are responsible for converting sound vibrations into nerve impulses. The Eustachian tube (A) is related to pressure equalization, the hammer, anvil, and stirrup (C) are part of the middle - ear for sound conduction, and otoliths (D) are related to balance, not nerve - related hearing loss.
2. Question 38: The organ of Corti is mainly responsible for hearing, not balance and coordination. Semi - circular canals (B), proprioceptors (C), and the utricle and saccule (D) are all involved in detecting balance and co - ordination.
3. Question 39: When pressure waves are generated in the cochlear fluid, the basilar membrane moves up and down, causing the stereocilia of the hair cells to bend against the tectorial membrane, which is part of the process of converting sound vibrations into nerve impulses.

Answer:

1. 37. B. hair cells of the organ of Corti
2. 38. A. organ of Corti
3. 39. C. the basilar membrane up and down causing the stereocilia of the hair cells to bend against the tectorial membrane